There are lots of swedish 'brown bess' muskets, marked tower, british proofed etc, and then remarked with swedish military numbers after export as seen here. Sometimes these have been converted to dog lock mechanisms as well. The lockplate doesn't have the expected tower etc markings but perhaps they have been ground off and reengraved. It looks like it may have had the beavers tail surrounding the breech which has either worn off or been sanded down, this would be expected on a military issue brown bess.
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