Description

This sterile (polished) case back can be used on most Seiko models. It is made of 316L stainless steel. It is delivered without a gasket (you should use the gasket from the case back it replaces).

You can choose “high” thread, to be used on most Seiko5 models (those have a low black dial holder, approx. 3mm) and when you use the grey NH3x dial holder. It is also available with “low” thread (good for most Seiko divers, those have a high black dial holder, approx. 3.5mm).

This caseback does not make your water resistance less if you have a diver and you use your original rubber gaskets. And also, if you have a 10atm watch, using this case back will not increase the water resistance, the water resistance of 10atm is influenced by the crown gasket and glass gasket too. So this case back is not to be used to increase the water resistance of your watch!

One nice aspect of this sterile case back is that you can apply engraving on it, nowadays many engraving companies are not willing to engrave a watch case, but on this loose case back, they can put everything you want!! Mind one thing, I added 20ATM and a serial on the one with low thread, because it is used in modifications mostly, so the serial adds the opportunity to add a warranty on the watch.

 

(The new SRPD-Sports based on SKX-cases need the high thread (4R36-07G0 and 4R36-08L0 case codes).

 

The case back with low thread also fits on the SNKL41 (7S26-01V0 watch case), but the OEM case back is not really high so there is not much to gain here (and the slim case back for the SNXS models also fits nicely).
The case back with the high thread fits on the Seiko5 models with 7S26-02W0 on the case back (like SNKE49, SNKK07 and the like). Here the OEM case back is already pretty low, so there is not much to gain too.

When you are not sure, put the case-code of watch you want to use it in the order-comment, and I will ship the correct case back.
You can find the case code engraved on the case-back, it looks like xxxx-xxxx, like 7S26-0020 or 4R36-07G0).

– sold without case back gasket –