Congrats on a couple of "Historic" G&L's.
Here are my comments and thoughts on the F-100:
Regarding the bridge:
All hardtail (Locktight bridge) F-100's that I have seen have just two mounting screws and are string through. We have several examples here on the G&LDP and Gallery.
Here's a photo of my 1981 F-100 bridge:
Regarding the neck pocket markings:

-The "REED 1-17-1980" was probably done by Steve Reed who was the Woodshop Foreman.
-The "Tom K. 1-16-80" is probably another G&L craftsperson.
-The "P.X. Gonar" is probably another G&L craftsperson.
-What looks like three initials in the bottom left of the neck pocket is also seen on the neck heel. But I cannot tell what these initials are, perhaps "JPQ"?
The fact that the bridge has no G&L marking or serial number leads me to think that this is a prototype of the "Locktight" bridge.
You might want to reach out to
Fred Finisher, who likely painted the body and neck. He mentioned in a past post that he worked with Steve Reed on many projects.
Also, check with Gabe (
GPD) and Larry Garret (
HLG), as they may be able to find some reference to a prototype F-100E hardtail guitar in the Log book(s).
The Gruhn Ad mentioned that the original shipping container had "Prototype" on it. Did you get the original shipping container and if so, can you post photos of it?
Again, nice scores on both guitars.
