X prefix serial number WWI Colt Frame

[Leggett71]

Was shown a Colt WW1 frame with a WW2 slide by an aquaintence. The frame had correct inspector marks per Poyer, JMG next to mag release, G & H on top the receiver along with an 8 and a Z.
Story with the 1911 is it was grandfather's who was in WW1. He was wanting to get info on his 1911.

The sticky wicket is the original frame markings, SN etc. has been ground off the right side of the receiver & replaced with an X prefix 4-digit hand stamped number. The number is from the group of SN's given to the Springfield Arsenal, table 5-12, Poyer 1925-53.
The US Property marks on the left side are only faintly visible under a 10X microscope.
Slide is an Ithaca with correct markings & a High Standard barrel.
Other parts appear to be a mix of WW1 & 2 vintage.

After reading another post from a couple of years ago on filed off serial numbers it appears there could be serious issues with BATF for having it in his possession. In an attempt to see if the pistol X prefix SN's are legit I noted in the same post comments like the numbers on the pistol in question in that post did not look like any the responding experts had observed on arsenal refinished receivers with X prefix numbers. Poyer dedicated several paragraphs to reclaimed X prefix frames but is there is little info I have found by searching the net. COOLGUN SITE has some pictures but Is there a source of more info on this subject?
With that in mind I would ask a couple of questions.
First, is there any way to verify the X prefix number is legitimate?
Second, is there any posted photos of Springfield arsenal restamps of damaged or recovered stolen 1911's to compare his stampings to.

Any information or directions to info will be appreciated.

Leggett

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