Only the C-record cranks had the hidden 5th arm behind the crank arm. And for the year I found this on velobase: "From 1980 - 1984 the year of crank manufacture is the last digit in a circle - "11" in a rectangle means 1985, "22" means 1986, and "33" means 1987" Is the Campagnolo winged shield logo engraved or printed on? The engraved logo are the earlier first generation (86?).