I highlighted red where the surface is filed/milled smooth whereas in blue part you can still see the traces of the original casting:I personally don’t see what Georg sees.
I understand what you are referring to and did notice it before. I still don't think that is necessarily means the mount was ground down and renumbered. I've seen plenty of mounts that look just like this that have the e/214 proof. It could just be variations in the manufacturing.
and thought that this was what you had referred to in here:The surface on the bottom of the mount looks different to me than what I'm used to with BLM mounts.
Hence I had pointed it out in detail. The second part of my post was just a suggestion, that it could had been factory scrubbed and reserialized. Maybe it wasn't taken as a suggestion and rather a claim. Sorry if that was the case.I personally don’t see what Georg sees.