Would this crown be proper reference for a speedmaster 2915-3 or 2998?
Thanx

 

Another picture

 

old threads:
https://omegaforums.net/threads/naiad-crown-and-early-speedmaster.21886/
https://omegaforums.net/threads/used-mercedes-speedmaster-crown.25023/

 

no definitely not - diameter is too small and the thread is 1.2 mm so for a cal. 38x of the 30mm family...