Dear Mr. Hynden,
The Security Division has informed that the shotgun is a side by side model 409 bis. It has been produced on July 1951 and sold in Italy on August 1951
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That is a great response. They obviously have a factory record for this one. It appears that the features of the 409 BIS changed over time.

rib type St. Etienne Well, now we know how to refer to it.

Pete