Although by no means is my limited observation determinative of all Parker shotguns, the ones I have seen that were factory restocked from pistol grip to straight hand also had the short, curved, single screw hole trigger guard removed and the long, straight, two hole guard installed. A common expedient when a non factory aftermarket change is made is to straighten the PG guard and weld on an extension, and add another screw hole. On all those that I have seen, the weld line is very visible on the underside of the trigger guard tang extension. On a few PG to straight conversions I have seen, the re stocker did not bother to even use a longer TG tang, but merely straightened the short PG tang and made do with that.
While all this explanation is what it is, it is much quicker and rapidly determinative to simply unscrew the trigger guard and lift up and rotate. On factory TG's the SN will be stamped on the iron underside and on factory stocks, the SN will be stamped into the wood of the tang channel. Its quicker to do that than even talk about it.
If necessary, I can post photos of factory PG and straight hand trigger guards. I am no Parker expert, but I have a few and seen a few. There is no difference in the trigger guards of double trigger or single trigger guns. A DT to SST conversion would have no difference on the trigger guard.
Many re stocks are quickly apparent as non factory and a common discrepency is in the comb nose. Here is a 1911 gun as made by Parker , which is the closest I have to the year your gun was made. This is a G stock, and does not have the drop points characteristic of a D stock.
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