Thanks for the reply!
I did go through that register and this one:
http://www.bannergibsons.com/registry.html
I guess I got a bit confused by the one you linked and based my assessment on the following lines:
1943 Range generally 9xx to 22xx, depending on the model.
1944 Range generally 22xx to 29XX, depending on the model, some with no FON.
But like you said the FON also fits with:
1600-xx to 2999-xx 1938 to 1940
Maybe I'll never get closer than knowing it was probably during the war due to the wood tailpiece. Maybe it was old stock or a mashup hence the logo? The neck heel is also kinda interesting, looks more like a 30's heel than a later flat wide one to me.