I have a ref. 2254.50 Seamaster which uses case number 168.1640.

The bezel click spring is broken in two and I'd like a retention spring on hand if it becomes necessary or desirable to replace at the same time. I think I need P/Ns

085ST0051 for the retention spring,
129ST0510 for the click spring

This seems correct for the full-size "Bond" and "Peter Blake" diver's and chronographs.

Thank you.

 

Any confirmation?

 

I checked on the Omega Extranet. Those part numbers are correct for that reference Seamaster.

 

With the information above, I ordered a spring. It's aftermarket, of course. The spring bearing surface is wider on the aftermarket and those fingers appear slightly taller. I will have it replaced during the next intervention but everything works as it should for now.