Jaws, several people have reported production codes that are not on the Makarov.com list. And the owners of that list admitted it was incomplete. I don't think there's anything unusual with the markings on that Mak. The "Y" pertaining to training is largely discounted and accepted to be an inspection mark, with the surrounding punch marks added at each station where the pistol was tested. And from what I can see I don't think the sight is adjustable. She's a beauty.