That does'nt look like an original Gibson bar bridge (deeper string anchor slots and the pole slots line up. Gibson is offset). I think it is a ca 1972-1973 Gibson EB-3 with varitone removed, a non original (Asian?) bar bridge which in fact dropped right in and has stayed there for a long time (the fading matches the contour of the bar bridge, not the Tune-o-matic). The neck has been sanded and refinished (not faded to brown and serial nr restamped in non original fashion).
I think it looks exactly like a bar bridge, version 2 (I have both versions). But if the instrument had a 3 point, where is the old posts?
My old EB0F came with a three point
upgrade downgrade, and the rear two posts are not in the same place as the bar posts.
Obviously, the EB0F now has a bar. Not sure how the posts of a tiltomatic are placed, though.
Hey, if I had a late 70's EB3 I'd probably do a bar bridge and pup switch mod too! Like it
EDIT: Why have someone put a PAF sticker on the bridge pickup? And all those pics of the 'fading' of the finish - not too common to be this 'desparate' to prove the authenticity of a late 70's EB3.