That is an Abercrombie, Fitch and Company shotgun. Manufactured by the Iver Johnson Arms and Cycle Works in Fitchburg, Massachusetts. Before they were a clothing company, they were a sporting goods company. The sporting goods company went out of business in 1977. Another company bought the rights to the name, and that is what you see today.
Looks like you nailed it.
The African safari outfitters!