Sounds like a good one !! I really like trapeze tailpieces on 12s, greatly reduces the stress on the top and allows for lighter bracing on that side which relates directly to more resonance and volume. In my research, there was also comments about some having dovetailed necks and some bolt-on... with that latter not sounding as nice. Also several references to some with two truss rods (perhaps prior to dual action trusses, with one adjustable from the head and one within the body) I'm curious. Looking forward to a few photos !!
Adjustable bridges were quite common in the 60s and 70s especially on the 12s.... mine has one. But I don't have the trapeze bridge, but wish I did. The top has this un-godly "belly" from the stress on the "pin saddle" that I'm going to have to address now that I have repaired the split braces on the underside. Seriously considering doing something like what Breedlove is doing in their newer guitars with that under-saddle brace and rod to the butt-block. Hydration and time hasn't done much to improve the profile and as of now it is almost unplayable without a slide. Even with only 6 strings installed in a light gauge.
"what is this quintessence of dust?" - Shakespeare