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Seiko v657-9010 crystal replacement loose

Question

This is my first attempt in replacing a watch crystal.  Watch is Seiko v657-9010.

  • After removing crystal, there was tacky/sticky substance on the crystal and the case.  It did not appear to be a gasket.
  • Crystal measures 30mm x 1.5mm.
  • https://boley.de/en/case-parts/seiko/33811.v657-9010 did not show a crystal gasket for this case.
  • The old crystal now fits very loose in the case.  Does Seiko use sealant or glue for this case?  What can I do to secure the crystal?

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Hi  you will probably find that the crystal has been changed before and the previous repair used a glue, Usually there is a gasket to seal and make water tight. You will have to source a gasket and a crystal and fit as a pair using a crystal press.

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The problem is neither boley.de or cousinsuk lists a crystal gasket part number for this case.  Also, the watch was purchased new and should not have been repaired.

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Thanks for your response.  The inside diameter of the case opening measures 30.11mm.  Should I buy the gasket based on the watch case or the crystal diameter?

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54 minutes ago, jdm said:

The gasket size specifies both inner and outer diameter, so it will match crystal size and case opening. 

However if you want to avoid buying a new crystal then use glue, that way you can do without a crystal press also.

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