Omega

I attach a close picture of the crown of an early Speedmaster showing the usual Omega logo but with a three-armed cross within. I would be very grateful for any information about the meaning and significance of such an added sign. In advance, thank you Zt...  

Hi, I have seen them on vintage Railmasters... " Naiad" waterproof crowns... They increase sealing with increasing pressure... This is what I recall from the back of my brain... but I stand to be corrected... regards erich

Hi Erich, do you mean Seamaster? Mmmmmh this do not really help at mine is a Speedmaster... Do you mean that early Seamaster, Railmaster and Speedmaster all had Naiad type crowns? I have now heard that this extra logo might be a distinctive sign of omega ... 

correct, this signifies a Naiad crown

No message body

I am slightly puzzled by the fact that we do not see more often. I know that crowns are often replaced. Maybe they Omega only produced Naiad cown with this logo for a very short period?

But on a Speedy...?? Must be a replacement surely...?

2915 and early 2998

You have to question the thinking behind fitting a pressure/depth responsive crown to a watch that had such limited depth capability though...?

Thanks for your input. The watch in question is such an early speedmaster. Ztirual