"An Illustrated Treatise on the Art of Shooting", 1906 dates the Lancasters to 1887
Miss Annie Oakley (Little Sure Shot), the celebrated American Lady Shot, who visited England in 1887 with Buffalo Bill's Wild West Show, writes:
New York, 8th Dec, 1888. "Dear Sir,—The four breech-loading hammerless guns you built for me are, in my opinion, as near perfection as it is possible to get them. The pair of 20-bores (weight 5 lbs. 2 ozs.), I have been using now nearly two years. I find them just as tight and sound as when new; I have never had any repairs except having the locks cleaned. The pair of 12-bores (6 lbs.) are as good as the 20's.
Since using your guns, and receiving a few lessons from you at your splendid private shooting grounds, my shooting in the field has so much improved that now I always make a good score, even at fast and difficult birds. With many thanks for the pains you have taken in making me such perfect fitting and fine shooting guns.
I am, gratefully yours,
(Signed) Annie Oakley, "(Little Sure Shot)"