This gun was originally on gunbroker. I saw it last week. I knew it looked familiar in the GI listing that started this thread. I went back and checked and here is the gunbroker listing which has a lot more photos.
https://www.gunbroker.com/item/869878826
The serial number he has listed is a 40,000 number and the forend is stamped with that (restamped that is). The water table stamping appears to be wiped out completely and the serial on the barrels is not visible. So who knows what the actual serial number was on this gun. There are a few areas of the engraving (the breech balls, and the trigger guard) that look like they could be original parker factory engraving for a high grade gun. That combined with the beaded Fences suggests that maybe the gun was originally a B grade or maybe A grade. But without knowing the original serial number of this mess, there is no way to confirm.
It also looks like the gun was at one time fitted with period aftermarket ejectors of some type.
It is a real shame to see what was a good gun be so “customized” like this. Or maybe over customized is the term. It is just hard to believe that along the way That anyone thought they were doing any sort of good.