Contact John Knibbs http://www.ukgunroom.com/dealer-directory/viewDealer.jsp?id=330

Knibbs wrote a book on the history of BSA called the Golden Century after he retire from BSA.

In regards to the BSA Francotte Martini's there is a great deal of contradiction between catalogs from one year to the next, Knibbs book and other sources. If I remember right that most of the BSA records were destroyed in WWII bombing raids.