I can't offer much help here - except to say that the bead blasting that was done is a very close match to the factory bead blast of a 625-3.
The trigger guard modification is either to allow fast trigger acquisition, or due to the owner having fat fingers (or fingers in gloves). At least they didn't do a complete "Fitz" to it. It also looks like the trigger has be "radius-ed" (the edges and face buffed/polished/rounded).
The porting doesn't look like anything I have ever seen from Mag-Na-Port, but I like it. You might send them a picture of the porting for verification.
Pretty sweet gun. Mark me down as first in line if you decide to sell it.
PS - the grips are pretty, but will probably hurt when shooting. I am a big fan of the Hogue finger grove solution for actual range time. I still keep my pretty wood grips for photo opportunities, but when at the range it is Hogue's all the way.