I've had good luck with night vision cameras to bring out faded stamps. Might want to try that if you have or know someone with a game camera. NVG's work too but I haven't tried one yet.
Your WWII pack is, in fact, a converted Canadian Pattern 1916 Dismounted Webbing Haversack! I've never been able to decipher the maker of these haversacks (they always seem to be in a circle), but your maker mark is probably the best I have ever seen on a nearly century-old item!
interesting bag, I wondered if it still had the internal divider and buttons, also the loops sewn on the inside front?
Agree SS Holden maker, there is a clear stamped example here, though his pics are not too close up
www.denner.ca under WW1 items
funny too, I just picked up another one of these 16 patt bags, mine has been converted also with the addition of a cloth bandoleer strap machine sewn to the back
Those pictures confirm that at least two Ottawa firms were engaged in the production of Canadian webbing in 1916, HUGH CARSON COMPANY, LIMITED & GRANT-HOLDEN-GRAHAM, LIMITED!
The latter went on to produce some selected webbing items in 1924 for the Canadian Army, as detailed in this thread...