 | |  | | | Seiko 5 #SNK807K2 Men's Nylon Band Blue Military Dial Automatic Watch | | | | | | | |
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| | Features | Japan 21 Jewel Automatic Self-Winding Movement (Calibre 7S26)Stainless Steel Case with Nylon BandDay/Date Display with Spanish Option, Luminous Hands and Markers, Hardlex Crystal for DurabilityCase Size: 37mm Diameter, 11mm ThicknessWater Resistant - 30M, Transparent Screw Down Caseback
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| | Description | SEIKO 5 - the meaning of the "5" A great marketer had the idea in the 70ies: to be a SEIKO 5, the watch has to have the following 5 (five) attributes (thus the name SEIKO 5): 1. Automatic, 2. Water resistant, 3. Shock resistant, 4. Date, 5. Day. Please note that some SEIKO 5's are in fact SEIKO 4's, if the "Day" function is omitted, then the Caliber 7S25 is used. The only difference to the normally found 7S26 is the omission of the day wheel. Also re-issues of SEIKO 5 Sports often use the 7S36 caliber. Again the 7S36 is similar to the most popular 7S26, yet it features 23 Jewels as opposed to the 21 Jewels in the 7S26. Please note that all these movements beat at a rate of 21'600 bph (beats per hour) or 6 bps (beats per second). As a comparison, an ETA 2824-2 beats at 28'800 bph or 8 bps. A Miyota 82xx beats at 21'600 bph. Why do I mention these three movements? Because they are found in probably 80% of all inexpensive automatic wrist watches. A market share that is huge, yet challenged these days (2006) by an increasing share of inexpensive China Made automatic movements An automatic watch (also called a self-winding watch) is a mechanical watch, typically with a balance wheel escapement, whose mainspring is wound by the motion of the wearer's arm, instead of having to be wound manually every day. Whereas a quartz watch is powered by electricity, a mechanical watch is powered by a mainspring which must be rewound for the watch to keep time | |
| | Product Details | | Package Length: | 4.8 inches | | Package Width: | 4.0 inches | | Package Height: | 3.9 inches | | Package Weight: | 0.65 pounds | | Average Customer Rating: |  based on 37 reviews |
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| | Watch Information | | Crystal Material: | Hardlex | | Clasp: | Buckle | | Case Diameter: | 37 millimeters | | Case Thickness: | 11 millimeters | | Case Material: | stainless-steel | | Band Material: | Cloth | | Bezel Material: | stainless-steel | | Dial Color: | Blue | | Movement: | Japanese-Automatic | | Calendar: | day-and-date | | Water Resistance Depth: | 100 meters |
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| | Customer Reviews | Average Customer Review: ( 37 customer reviews )
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Most Helpful Customer Reviews
247 of 252 found the following review helpful:
 Great engineered product Jun 14, 2008
By Dirk J. Willard
"Dirk Willard"
I am still in the process of reviewing this product. Here's what I have so far:
Xbar 107 seconds/week (runs fast) (7 min./month compared to 2-4 sec./month quart watch)
St DEV 27 sec.
N = 7
95% CI 2.447 using Student's t
m+ = 136 seconds/week
m- = 78 seconds/week
Summary:
Good points:
* Beautiful with dark blue face, white symbols, functional medium blue nylon band;
* Easy to read, even in the dark;
* Easy to use with uncomplicated settings similar to other watches;
* Compact design;
* Measurement consistency is excellent compared to quartz mechanism.
Bad points:
* Difficult to set time (see instruction below);
* Gains 10 seconds a day (consistency); and
* Does not have a manual wind stem.
Discussion
This watch looks great. Unlike other self-winding or kinetic watches, this one is compact. In the best tradition of Japanese product development they thought hard on how this watch should function and say about the wearer. The hands are easy to reading, even for those of use with failing eyesight. The second sweep hand has a read tip allowing easy setting of the time.
Unlike some Japanese product, they provided a short, simple instruction on winding the watch. Here, I am comparing them to Citizen's ecco-drive watch, which I also own. Just gently work your arm back and forth for three minutes and the self-wind watch will charge; or, you could wear it for a day.
Okay, now for the negatives. First, this is not your quartz watch. The original self-winding mechanism was invented, according to Wikipedia, by a Swiss watchmaker in 1770. Since then it has gone through several improvements but is not as accurate as the quartz mechanism popularized starting in the 1970's. Sieko warns that this watch could be off by as much as 10 seconds a day. One days use indicates that my watch runs about 10 seconds fast.
The great watchmaker Harrison, who invented the first chronometer accurate enough to track longitude, said that consistency is more important than accuracy. (A poor copy of one of Harrison's chronometers was carried by Captain Cook on his circumnavigation of the globe. He had nothing but good things to say about it.) I have another self-winding watch, an Armitron, which runs consistently 15 seconds fast on days that I wear it.
From my measurements of quartz watches, their accuracy, while dazzling when compared to old hand-wound watches, are less accurate than my old German pendulum clock. So I am told, the longer the arm, the more stable the swing and the more accurate the timepiece. I compare everything to atomic time. And, because the quartz mechanism is battery-driven, it seems to suffer from inconsistency. I carefully measured my collection of six quartz watches over a 2 year period. While the battery was new, the error was consistent. As the battery burned out, the error became difficult to predict. Sometimes a positive error (adding time) would become a negative error (losing time) as the battery died. This dying period was also hard to predict.
The accuracy of the quartz mechanism is not as good as my pendulum clock. They all lost or gained approximately 2-3 seconds, on average, per month.
Based on a week of measurements with the Armitron, I would say that it is shockingly inaccurate but consistently so. Assuming that the Sieko error continues to be consistently 10 seconds fast this will mean that I will have to reset it every week. This is a small price to pay for an otherwise beautifully crafted and honestly-priced handiwork.
Setting time
The date and day are fairly easy. I suggest turning the watch arms until the click past a day so you won't be twelve hours off.
Setting the time is another matter. What works best is to set the hour and minute hands, then gently hold the second hand. It should pulse a little as it tries to force itself forward. Once the seconds are accurate, release and the second hand should be accurate. It takes a little practice at first and don't set the time until you pump the watch 3 minutes to charge the spring.
Time to unwind
It takes about 39 hours (1 test) to unwind.
If this review was helpful, please add your vote. Thank you.
25 of 26 found the following review helpful:
The perfect watch Sep 23, 2009
By World citizen
This is a very special watch in several respects: You can see the clockwork through the transparent backside; both day and date are shown; there is no need for battery changes, nor manual winding up of the clockwork. The strap is solid and washable. I have become very attached to it ...
23 of 25 found the following review helpful:
One out of four Jun 29, 2007
By Jan Husdal
This watch comes in 4 models, SNK 803 with a beige strap and dial, SNK 805 with a green strap and dial, SNK 807 with a blue strap and dial, and SNK 809 with a black strap and dial. What I like most is the red tip on the seconds hand that sweeps continuously across the dial and not in steps for every second like in most analog watches. Also cool is the untraditional numbering of the hour markings, where the 5-minutes are more protruding than the hours. The strap looks better in the photos than in reality, but it's still very nice and tough-looking, although it is narrower than you think when you see it on the guy's arm in the pictures above. The see-through case is a gimmick I could do without, but anyway, nice to watch the watch work. Buy all four and you have one to go with every occasion and dress colour/code. This item sells on eBay for 30-40 dollars.
9 of 9 found the following review helpful:
I'm loving this watch! Jun 28, 2011
By C. Perry
I've owned a Baume & Mercier automatic and a Longines automatic watch for years. Since the other two watches set my wallet back quite a bit, and also since I've "acquired" a wife and two little ones since their purchase, I didn't want to break the bank this time around. So, after reading reviews for this little gem, I pulled the trigger and scored one for twenty-five bucks less off of eBay. This watch is simply beautiful! I've owned it for three weeks and it still has maintained the same time as displayed on my cell phone. Hasn't lost a minute. It's performance is on par with my other two automatics, but I spent literally thousands of dollars less on this purchase. I was in the market for blue-faced watch that I could wear with a pair of british tan shoes and belt, so I took the liberty of replacing the blue nylon band on this watch with a cognac-colored Rios leather band I also purchased off of eBay. I also replaced the buckle with a Hadley-Roma deployment buckle with brushed stainless steel finish, which matches the brushed metal of the watch perfectly. Check out the 3 pictures I've uploaded. Nice right? I actually ended up paying more than the watch itself for the leather band and deployment buckle, but hey, considering how much I saved on the watch, it was well worth it. I plan to have this bad boy for a long time. Thank you Seiko for making affordable, sporty automatics at a super affordable price.
9 of 9 found the following review helpful:
great self-winding watch Nov 21, 2009
By P. Miller
I've had this watch for 2+ years and wear it daily. When I first received it it would gain 3 minutes a day, but after a month or so, it settled down and now is off maybe 1 or 2 seconds a day. It looks great, is rugged, and very comfortable. Can't go wrong on this one, and you'll not be shopping for a battery every year.
See all 37 customer reviews on Amazon.com
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