Looks like a nice one! While it may have an end of 1994 neck block date, it was definitely completed early 1995.
Oh yeah, I just love that reddish burst!and the burst if fantastic.
Mainly, the F412 has more bling - the Guild shield on the headstock, the fancy fret markers, maybe an abalone rosette. The backs are the same - braceless arched maple fine laminate. Some JF30-12s have ebony fretboards, but AFAIK most are rosewood. Not sure about the top bracing. They're both killer 12-strings. (The F512 has a solid rosewood back, with all the bling.)what are the main differences between the JF30 12 strings and the F412 and F512?
Forgot to add, all F412s and F512s have ebony boards.Some JF30-12s have ebony fretboards, but AFAIK most are rosewood.