It is 43mm and has a date display, and the same old 3 bar water rating. It also has an in-house manual winding movement, Caliber 02. Interesting that the manual winding movement has 39 jewels, which makes me think it's a modified automatic movement. It's also high freq (28,800 vib/hr). On the plus side it has a 70 hour power reserve. Limited to 1,962 pieces. I like this Cosmo a lot. It's a very nice 50th anniversary tribute.