Thanks everyone for your opinions. It has me stumped also, hope a few more people chime in. If it is a knockoff,
They sure did a good job. Plays and sounds just like a J-45. Dad was in WWII in the Pacific theater so there may be something to j45nick's theory. The guitar, (as the story gose), was purchased new in a small town in northern VA.
where my parents settled after the war. It set the stage for 70+ years (and counting)of marrage (in thier 90's now)
I'll post some speck's below to possibly help clarify some things about it.
The numbers on it are ==U681_33== (in ink) Body width (widest point 15 1/2)
thickness 4 5/8, height of body 19 3/4, overall 40 1/2. X bracing behind sound
hole (bottom side), Tall scalloped ladder bracing elsewhere, 20 frets
baseball bat style neck.