interesting. well, if you want to investigate further, i would contact gruhn or a shop that is local here in rochester but highly respected called
Bernunzio Uptown Music - Guitar Sales, Banjo Sales, Stringed Instruments, Vintage instruments, Rochester, NY (585) 473-6140. send pics and dimensions and youll get the proper model which is important for insurance and resale etc... there are many good vintage gibson archtop/acoustic books you can look at at barnes and noble or the library too... you might even contact Gibson directly with the info...