Strange confluence of internet events; this thread was a sticky but disappeared into internet space about 3 years ago, and was just rediscovered. Anyway - might be helpful
http://www.shotgunworld.com/bbs/viewtopic.php?f=5&t=232252

Von Lengerke & Detmold were major Francotte importers and sales records still exist. A research letter can be requested from Bob Beach, who has also graciously provided information on this Forum
http://www.griffinhowe.com/research-main.cfm

VL&D booth at the first annual Sportsmen's Exposition in Madison Square Garden, New York, 1895
Sporting Life
http://library.la84.org/SportsLibrary/SportingLife/1895/VOL_25_NO_09/SL2509025.pdf
Forest & Stream
https://books.google.com/books?id=n0IhAQAAMAAJ&pg=PA419&lpg

https://sites.google.com/a/damascusknowledge.com/www/home