Robert- unlike most of the Belgium junk with the Parker name we see, your gun's proof marks show it to be a British gun from Birmingham, although a lower grade maybe made for export. there were several Parkers in the gun business in England dating back to the 1700s.
what I find interesting is the 12 in a diamond -I am not an expert on British marks - but that mark I thought was later and from the London proof house for chamber length. Possibly there was a later alteration done by a London repairman.
posting it on the doublegunshop.com board may get you a better answer.
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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