Just stumbled into this, and at first blush, I thought it might be a
GF60, but the headstock doesn't appear to be the right shape. The body looks to be GF size, but
I wasn't aware of any of that body being produced in the custom shop.
Not sure why you thought it was a Custom shop model but in fact one of the first Custom Shop models was an F44MC
You're right technically "GF"'s weren't produced in the Custom Shop but one of their earliest builds
was the F44MC.
Those looked more like the Gruhn mini-jumbo outline as opposed to the Valencia and 45th Anni's which used the original slightly different '50's F40 outline.
Additional insight in post 5 here:
http://www.letstalkguild.com/ltg/showthread.php?195762-Guild-Nashville-Custom-Shop-F44
(You actually posted in that one! Maybe I just misinterpreted what you were getting at)
Funny, the picture of the
GF60 on westerlyguilds.com shows a different headstock. A GF60 it is!
Not sure if headstock shape actually changed during GF series production (and the Nightbird headstock
was the original snakehead), have never been truly sure if the perceived shape differences might be explained by camera angles in pics, and/or other potential distortions created by side-effects of digital image display (auto-adjust of aspect ratios for example)
BUT:
Notice the difference in size of the slotted diamond inlays, the thicker inlays are holdovers from the earlier Gruhn F44's.