It was introduced in '85, but first made in '84.... I've got a NOS "take-off" C-Record crankset with the 4 in a circle date code. These came on a Merckx TT (funny) bike, which had Cobalto brakes, the Campagnolo alloy freewheel, and was all C-Record except the hubs for some reason... They were Nuovo/Super type.