166.089 crystal replacement

Endshake · 2026-04-19T12:28:21-0500

Hello guys im currently working on a Omega seamaster 166.089 cal.752. I removed the old Mineral crystal and want to install a new one. But there is this brown gasket. Should i leave it in there or where can i find a new one?

Archer · 2026-04-19T14:11:44-0500

That is the crystal gasket, and you will need a new one - part number is 098EG0007.

Endshake · 2026-04-19T15:21:44-0500

Perfect. Thank you!

Is there a list where i can find those spareparts in the Future? Where i can tipe in the referencenumber and find crystals and other parts?

Should i put in the gasket in the case first or press it in together with the crystal?

Archer · 2026-04-19T15:32:33-0500

Endshake
Where i can tipe in the referencenumber and find crystals and other parts?

You can't - there's nothing like that publicly available. It's only for Omega and for Omega certified watchmakers.

Endshake
Should i put in the gasket in the case first or press it in together with the crystal?

It's described as an L style gasket, so they can be tricky depending on the exact construction. Generally you put the seal in the case first, but there are some exceptions.

See here for more:

https://omegaforums.net/threads/basic-watchmaking-tips-crystal-fitting.155470/

Thread 'Basic watchmaking tips - crystal fitting' ·

This is #10 in my series of basic watchmaking tips - the others can be found in the Watchmaking forum, or by searching on the "Basic watchmaking tips" title.

Fitting crystals in wrist watches is...

Archer · Jan 30, 2023

166.089 crystal replacement

Endshake

Archer

Endshake

Archer

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