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A number of questions for Seiko diver experts.

For the Seiko experts:
I see a multitude of almost identical Seiko divers. Is there a source to determine details, e.g., type of crystal and what sets them apart (the water resistance level is pretty clear)?
Also, what is the significance of the 7S26 caliber (and how/where can I determine which models have this or others)?
Finally, if I am not a diver, do I care whether I purchase the SKX023K2 (100 meters) or one that is 200 meters or 150 meters. (And a truly final question: Is the really a 1.5mm difference in size between the SKX023K2 (listed at 36mm) and the SKX023J (27.5mm) as listed on two separate sites?)
Thanks in advance for the input.
Arulus
Answer:
: For the Seiko experts:

Aside from the WR most of the divers made today have the trusted 7s26 movement. Some of the professional divers employ other movements, but the basic sports divers are the 7s26. The 7s26 from what I've read is a great movement, usually runs fast (i can tell you that from experience) btu can be regulated to do well. It also cannot be manually wound or hacked but has a terrific power reserve.
It's best to contact a dealer and get an accurate measurement on the watch. I've seen some list a watch that is definitely 47mm as 39mm!! That's pretty far off. Or if you can print a straight on shot of the watch do so and measure the lug spacing with your ruler. Next, take that # and divide it by the actual lug spacing (usually 22mm for Seiko but can be obtained by forum goers). Then measure the picture across the width of the watch and multiply it by the lug space # obtained by the previous step and there you go! This works when you just can't get your info. from the source or you want to know the width plus crown...
Good luck with your purchase, you're sure to enjoy it!
-Kev
:

Also, what is the significance of the 7S26 caliber (and how/where can I determine which models
have this or others)?



Finally, if I am not a diver, do I care whether I purchase the SKX023K2 (100 meters) or one that is
200 meters or 150 meters. (And a truly final question: Is the really a 1.5mm difference in size
between the SKX023K2 (listed at 36mm) and the SKX023J (27.5mm) as listed on two separate sites?)



Thanks in advance for the input.



Arulus