'Langley Patent Shoulder Grip', 1891
https://books.google.com/books?id=hc46AQAAMAAJ&pg=RA8-PA45&lpg



https://www.the-saleroom.com/en-gb/aucti...145/lot-3806414


Feb. 11, 1893 Sporting Life
MODIFIED GUN STOCK.
Something New From England Which Isn't Popular
A representative English gun firm recently devised a new gun stock which is quite a novelty, but not likely to find favor with many sportsmen. The firm terms the new stock a modified stock. This stock, while retaining the extreme drop at the butt, has a parallel bend along the face line from the comb to five or six inches back, giving the same alignment at any point between these limits, subject in some cases to slight modifications.



This ad is in "Pigeon Shooting" by A. W. 'Bluerock' Money, 1896 but I don't know when Scott first offered the Monte Carlo stock.
Cornell Pubs has a 1893 Monte Carlo B flyer with no mention of the stock
https://www.cornellpubs.com/old-guns/item_desc.php?item_id=2991



Sold by Kirby Hoyt
https://www.gunsinternational.com/guns-f...=101261239#lg-2