I don't know..IMO looks like a die scratch to me, and not an upside down Y..that's what I see..like I said..IMO
Edited: also remember 1983 was the first full year for copper plated zinc, in which they had many problems with the plating process...what you marked below could just be dust/debris under copper plate, or plate bubbles/gases
Edited by Greasy Fingers
06/07/2019 7:46 pm