Hello,

I noticed that there were Seamasters with 166.010, 166.010 SC and 166.010 SP (possibly other versions as well).

Does anybody know what SC and SP refer to?

Thanks,

Roger

 

SC=Center Sweep seconds hand

 

Thank you. OK, so I am wondering what SP could mean then.

 

SP.....better water resistance if I remember correctly

 

Thanks, that helped me looking into the right direction. Found this old thread that confirms what you said about water resistance (see page 2 of the thread):

https://omegaforums.net/threads/speedmaster-caseback-sp-reference.2482/page-2

Apparently, SP stands for Special. According to Archer, the only difference for a Speedmaster SP vs. a standard Speedmaster were different crowns and case tubes.