I don't know what you got. I have 2 GRs that are 73 &74. They have the same lugs and no braze-ons, and the Serial # is stamped in the rear drop outs. Mine have the Vagner crown with the raised triangle on top of the crown. It is machine finished sharp on the shoulders of the grown. But, mine have the old Flying Wings head badge made of either alloy or plastic. Your badge looks to be 77-80? And Mine are chromed under forks and most of rear triangle, I know because both are re paints by me. I'm the one that destroyed the decals and hand lettering. I would think it's an early 70s with a new head badge. Dickey Greer West Monroe,La Dickey's Recreation Room