Bob,

The Francotte was built in 1961 since it has the Greek letter Phi as the date code there among the proof marks. It was received in inventory at Abercrombie & fitch in NYC on October 20, 1961. The model is a Grade No. 20E according to the A&F record book. The listed specifications seem to match those that you have described. The shotgun was sold at A&F for $675 later that same month.

Compliments of Griffin & Howe, Inc.

http://www.griffinhowe.com/research-main.cfm

Bob Beach