Seiko Divers Watch Sizes - Watch Case Dimensions

Even if you’re not new in the wristwatch world, it may be hard to remember your Seiko case dimensions from the top of your head or even have it written somewhere close to yourself. The watch size is, as collectors would know, super-important, from more than one reason. Not just so you can pick the right sized watch for your wrist, but also if you want to replace your watch band and especially if you’re into Seiko mods. As we’re talking about premium quality when it comes to Seiko, there shall be no room for mistakes in none of these cases and that’s why we’re compiled this quick watch size guide on the most popular Seiko diver models.

Of course, nowadays, one can learn almost everything yourself, especially simple things like how to change your watch strap. But as time is the most precious thing on Earth, some shortcuts are always of help, especially if you’re a novice. Instead of Googling things like how to measure watch case size and risking not measuring it correctly, whether you’re buying a new watch or just want to replace your watch band, you can simply use our watch size chart below and find the correct info for your model.

Sure, what you’ll have to learn on your own are some other things like, for example, how to remove watch band, how to put on a Nato strap or how to adjust mesh watch band (hint: we have some useful guides too!), but these are all things you’ll learn once and know for the rest of your life. Having the watch case dimensions in your long-term memory, especially if you have more than one watch, may be unnecessary burden. The information compiled here is made to make your job easier so making a bookmark of this page may be your worthy shortcut. That way you’ll instantly know if the watch you want is too big or too small for your wrist or which watch strap size you need to buy to perfectly fit your favorite watch case (astonishing Seiko mods, here we come!). But let’s first define some things so you know how to use information on this page.

How to use information on this page

Basically, what you’ll have to do first when you’re buying a watch is to learn how to measure wrist size for watch so you can adjust the watch strap to fit your wrist properly. It isn’t too wise to rely on widely available web-based info about average men’s wrist size (or average wrist size women) as you want your watch strap to keep your precious timepiece securely on your wrist. Aside from that, don’t forget to include the spring bar distance from the table below into the count, as that is basically the length of the watch case lying on the upper side of your wrist. This is less important in case of a strap on bracelets, where you need to take only strap on sizes into account, but it is important to mention, especially if you have wrist larger than average, or a small wrist, that is.

Since other dimensions are pretty straightforward, there is only one that may confuse the novices and in case if there is any of you wondering what is a lug width, here is your answer. The lugs are side extensions of the watch case, often referred as watch horns, that are serving the purpose of securing the strap to the watch case. Naturally, not all lugs are created equal. Most often, watch cases come with 18mm, 19 mm, 20mm, 21mm or 22 mm lug widths. This is important, since, for example 21mm watch strap just won’t fit in 22 mm case, so you’ll have to be on point with this.

So instead of wasting your time to learn how to measure watch size, use the information available below to quickly determine what kind of a watch will fit your wrist and what kind of a watch strap fits your beloved timekeeper. Once you determine your watch case dimensions, you’ll always know what Seiko replacement bracelet you’ll need for your favorite divers. And that means turning your already charming accessory into a shapeshifter that you can take on all your adventures, whether they be diving around Maldives, a basketball game, a fancy dinner or super-important business meeting.

Size Guide to Seiko Watches / Measurements Charts

In the tables below, you’ll find the dimensions of popular Seiko watches, mostly from Seiko Prospex series. Whether you need to check a watch case dimensions for a new buy or lug size info in order to buy a fitting replacement bracelet, below you’ll find worthy info on models such as Seiko SKX007, Seiko Alpinist, Seiko Turtle, Seiko SARB033, Seiko Sumo, Seiko MM300, Seiko MM200, Seiko Samurai, Seiko Solar Chrono, Seiko 62MAS Reissue, Seiko Cocktail Time Power Reserve and many more. These information is usually available on both the Seiko website and the booklet you have got within your watch package, but it’s always worthy to have it double-checked, from at least two sources so it doesn’t happen that you buy the watch band that doesn’t fit your watch. Other than that, if you’re interested in dimensions of some watch model that is not shown below, don’t hesitate to reach out and we’ll gladly help you determine the right dimensions of your watch.

The most Popular Seiko Divers Watch Dimension PDF file for Download

Click on the image to DOWNLOAD

Seiko Watches Size Table & Detail Images

Part 1

Seiko Watch Band 19mm - 20mm	Watch Lug Width	Watch Case Diameter	Spring bars distance	Watch thickness
Seiko 5 SNK809	18mm	38mm	43mm	11mm
Seiko SLA017	19mm	40mm	44mm	14mm
Seiko Alpinist	20mm	38mm	43mm	12mm
Seiko SARB033	20mm	37mm	40mm	12mm
Seiko Sumo	20mm	45mm	47mm	14mm
Seiko MM300	20mm	44mm	45mm	15mm
Seiko SKX013	20mm	37mm	41mm	13mm
Seiko SKX023	20mm	37mm	41mm	12mm
Seiko Cocktail time Power Reserve	20mm	40mm	45mm	15mm
Seiko Solar Chrono	20mm	43mm	46mm	14mm
Seiko Monster	20mm	47mm	45mm	13mm
Seiko MM200	20mm	41mm	43mm	13mm
Seiko 62MAS Reissue	20mm	43mm	45mm	14mm
Seiko 63MAS	20mm	43mm	40mm	13mm
Seiko Mini Turtle	20mm	39mm	40mm	13mm
Seiko 5 40mm	20mm	38mm	40mm	12mm

Part 2

Seiko Watch Band 21mm - 24mm	Watch Lug Width	Watch Case Diameter	Spring bars distance	Watch thickness
Seiko Pilot Flightmaster	21mm	42mm	44mm	12mm
Seiko SKX007	22mm	41mm	43mm	14mm
Seiko SRP777 Turtle	22mm	42mm	45mm	13mm
Seiko Samurai	22mm	44mm	46mm	13mm
Seiko Tuna SBBN013	22mm	49mm	36mm	16mm
Seiko Tuna SBBN039	22mm	47mm	42mm	16mm
Seiko Tuna SBDB009	22mm	49mm	44mm	17mm
Seiko Tuna SBDX016	22mm	53mm	40mm	17mm
Seiko Tuna SRPA82K1	22mm	52mm	46mm	13mm
Seiko Atlas SKZ209J1	22mm	42mm	46mm	14mm
Seiko 5 Sports SRPD (42.5mm)	22mm	41mm	41mm	13mm
Seiko SNZF17 Sea Urchin	22mm	41mm	46mm	13mm
Seiko Recraft SRPC13 Blue	22mm	43mm	36mm	14mm
Seiko Kinetic PADI SUN065	24mm	50mm	48mm	15mm