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Originally Posted by JJ Irani
Yes, the SD is almost 2 mm thicker than the Sub. The Sub-date weighs 135 grams, while the SD = 148 grams. The Sub dial = 30 mm, but the SD dial = 29 mm.
And the raised lens over the date window is the Cyclops....it magnifies the date 2½ times.
As for the Helium valve (gas pressure valve release), it's highly unlikely (virtually 100%)  that you will ever need it. If you prefer the cyclops, then the Sub-Date is a more practical buy. If you prefer the smooth, flat crystal look, then the SD is KING!! 
Cheers - JJ |
Thanks for the great info.
I never could figure out the small diffs. Now its a hard decision. I dont think the SD is for me as I am a huge fan of the cyclops.
JJ, how are you enjoying your YM? I have been debating on a YM TT or YM Platinum.
Cant decide.