Oceanographer case 2892 "wavy" case retainer ring

Hello,

 

not it sure of the name and haven't had luck anywhere. My Oceanographers movement is loose in the case. Had tried the repair forum but still no luck. My case is stamped 2892 and is missing the wavy retainer ring. Anyone have one or now of the part number? Any and info would be great!

 

thanks,

 

kyle