anyone have knowledge about 505?

i just bought one from sungei wang jeans store(3rd floor i think, pretty big shop) few weeks ago, and i just checked today that the main button is copper and has no number behind it. zip has levis on it. made in china. payed rm230 for it. deos every levis have a number behind the main button? if there is, then this one confirm fake? cause if it's fake i'm taking it back and gonna raise hell there.