Generally concur on date, though I might extend that to late '80s. I'm not sure when the painted forks with the coin in the crown stopped appearing.

My recollection is that Gios didn't come to the States til at least 1975. The first two I saw were ridden by guys in my club in 1976. Then after A Sunday in Hell (1976 Paris-Roubaix) was released, they started appearing everywhere. I bought mine in 1979. It has the early chrome fork and a "G" cutout in the BB shell.