This is an 18 size, Open-Face, Screw Back & Bezel, Gold Filled,  A.W.C.CO., Case, Warranted for 20 years. Made by "The American Watch Case Co., of Toronto, LTD." 511 King St., W. Toronto, Ontario, Canada. 

Highly Hand Engraved, Case Back.

From the Front.

Coin Edge, with Thick Crystal.

Screw Back & Bezel, Warranted for 20 years. The Style indicates it was made around the Late 1800's or the Turn of the Century.

I bought this Canadian Case to go with my Hampden, John Hancock, ON3L-A, that has a Canadian Dial [Roman, 1 through 12 & Arabic 13 through 24, Numerals]. As a "Canadian Market" Hampden it would have, most likely, had a Canadian made Case.