Gibson started using the long (pointed) pickguards on J-45's in 1955. Also, both of the J-45's I saw on stage at the Lincoln show in February had the pre '59 sunburst so I would guess both of the J-45's he takes on tour are between 1955-1958 models. The B-25 is anybody's guess. If I had to I would say 1964, give or take six years . On both account I could be wrong, wouldn't be the first time. By the way, he still has the one seen in IATTBYH, same Grover rotomatics, same little pictures above the fretboard on the treble side. LJ