As I said, not many of them left (in Sweden anyway). The classic Crescents has a strong national and international following. MCB digits are far from correct, but starting number 4 indicates mid to late 70`s of making. In this case with the stainless, many frames were scrap or had cosmetic problems (returned to MCB), why closer dating is almost impossible.

Really cool that you´re the original owner, you could be the only one knowing what exact year it was made. There werent many made, and there were only two persons at MCB responsible for the assembly. So, if you bought it in -78 its most likely a -78 or "left over" -77.

It seems like you´ve got a Mark XI with sugino cranks, mafac center pulls, sun tour derailleurs. Do you also got Campy Nuovo Tipo hubs and Agrati seat post its a Mark XI for sure. You should have a Ideale 45 seat aswell (not Kashimax as I stated before).