Hard to get too specific - the pics are pretty fuzzy (does your camera have a macro setting?). It looks VERY clean. Is the barrel breach parked or in the white - should be in the white if original finish/assy. On the oprod, if the modification is still bare metal then it could well be original finish, but if the mod is parked then it is obviously refinished (though it could be almost contemporary). On those pics I am not seeing anything flagrantly wrong with the cartouch. Serial range seems early for a type 3 lockbar and it even looks out of place.

Overall I would say that it looks like it has been helped a little at the least, but if it is a put-together then they sure seemed to have some nice parts from which to draw, and short fork rods and single slot lock screws are just tough enough that those are usually the parts skipped. It sounds like you did OK on the price, do you have any Garandicon guys like Gus Fisher nearby that can give it a going over before you take it the range?

Congrats - looks very nice.

(I was trying to find a good GAW to post for you so you can compare it yourself, but I can't seem to find a nice strong one - maybe someone else can post a good pic of an original GAW).