Gentlemen (& Ladies if there are any here)... I have rotated, enlarged, enhanced, and mirrored the image from the auction ad and also created a negative copy (top) to examine as closely as possible the area where a serial number would be...
The results are inconclusive to me based on the photographic evidence. I would need to see
a much clearer focus photo in order to offer my personal opinion on whether or not this magazine bottom has been sanded or otherwise modified...
Here is the photo as modified for your viewing pleasure...
Just my