Be necessarily convinced in accessories of jeans - "lightnings", rivets, buttons before them to buy. On firm jeans put only accessories with designation YKK (and is not present TIT, MKK, TLF and to that similar) or own if that is made. Only at a firm thing on "doggie" of a lightning, on an underside rivets and buttons it is possible to read accurately a trade name or the trade mark. "Doggie" should have a double clamp and not slip, even if the lightning is not clasped up to the end. For example: «L.S. And Co-S.F.». That means: «firm Levi Strauss and Co, model San Francisco». If such marks are absent or to disassemble them it was not possible, will put jeans back and any more do not set to the seller any questions. By the way, «Levis 501» is issued only with a clasp on "bolts" - five buttons.