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Nice piece. I wish I could be more helpful with the identification.

The hasps and swivel keepers resemble a pre-WW2 style which was used in particular on No.15 Sniper Rifle Chests and transported to Canada for CNo.7 .22cal rifles. Steel not brass. I have several dozen of CNo.7 chests waiting to be stripped - hardware in one pile, rotten wood in another.