Bianchi frames of this apparent level and era typically have the serial number stamped on the front of the top head lug. Later, they used the seat lug and BB shell, but I'm not seeing anything in the usual locations. However, assuming it is a Bianchi, it would be one of the Rekord 74x variants.

That CdM decal was used from the 1974 model year through the rest of the 1970s. The Calibrati 1-20 decal indicates a lightweight , hi-tensile steel and was used on the entry level models and also some of the lower-mid-range models through circa 1978, before Columbus introduced Aelle. Perhaps you should verifiy the seat post diameter, to ensure it is consistent with that used on the Calibrati 1-20 tubesets.

Offhand, I don't recall seeing those lug or BB cutouts on Bianchi. Also, I'm used to seeing Bianchi branded dropouts and not ones marked Gipiemme, at least not this early.