I would not put too much credence into rlxDeusIrae's 'double curve' indicator of gen-ability. None of my gens (including a gold capped rivet) have that profile
And, to complicate matters more, there are myriad variations within the range of clasps Rolex installed on their vintage bracelets during the 50s through the 70s. There are also design differences between bracelets destined for the US vs Europe. And when you throw in all of the bracelet musical-chairs shenanigans that vintage Rolex bracelets are being subjected to by rogue sellers (which can fool even the most fastidious of 'authorities', if you are not careful), you can end up with a bracelet composed of parts from several different (gen) sources. Further, my Yuki's clasp closely matches 1 of my gens (gen top, Yuki bottom)
A better indicator (unless Nanuq's samples have since been corrected) is the lack of polished surfaces on the underside of Yuki's rivet 7206 (the gens are polished). Of course, this can (& should) easily be remedied with a few minutes of Dremeling & some rouge (if/when you are able to sort out the too-small springbar loop issue).