The paint scheme is 1981-1982 Hoonved-Bottecchia Team. In 1980, I believe it was all black (very similar to SCIC-Bottecchia from previous years). No serial number may indicate not a serial production bike (I've seen clearly stamped serial number "S.1074" on one of replicas) or that is not a Bottecchia. Dia-Compe brakes doesn't look right too. Clearly nobody can tell for sure that this is genuine Bottecchia, we can only guess. Thanks for sharing.