I just received my second 16660 Sea-Dweller, this time a Mark 2 from 1981 (7 mill. serial). Compared to my MArk 1 I think the gas escape valve sits very low into the case. I appologize for the crappy pix, but you should be able to see it "sink" into the case instead of matching the curve of the case. On my MArk 1 it fits perfectly, however the case of the Mark 1 has had the case buffed, whereas this Mark 2 looks unbuffed.Is this...normal??

Gas Escape on my Mark 1


Gas Escape on my Mark 2


Also, the serialnumber of the case is printed on the inside of the bracelet clasp. Not seen this before...or never paid attention to this deail before. Is this normal??

I appologize if the pix do not show, but I don't quite understand how to post pix here.