The gun serial number would be on the side of the barrel lug and matches the SN shown in the photo of the trigger guard. The Jos. Whitworth barrels are individually numbered and stamped on the barrel flats.
By way of general comment, there is a list of about 70 known correct A-1 Specials. It is widely believed that there are more Parkers upgraded to look, more or less, like an A-1S than there are correct guns, although I can't say whether that is true or not. I don't know of any list compiled of upgraded guns, some of which are easy to determine, others not so.
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