If there are no visible makers marks, logo's, etc. it's going to be rather difficult to determine who actually made it. Does it have the Italian proof marks and date code? What about an importer name? There were several small companies that got a share of the market in the 1960's and 70's before either dropping out or being absorbed by other firms. If there are no marks at all it was most likely a kit gun and whoever built it removed them during the finish process. Not likely to be any internal marks that would help either
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Ah. Thank you.