Serial No. #47, #49, #51, #52 are SSB with mustache like tail piece.
And Tiran Porter's LSB has same tail piece, maybe the serial No. is around 40's (#38 or #43 ?).
These preamp are PF-5 on #47 and T.Porter's LSB, and PF-6 on others.
Because, I think this guitar is #48 but 73' or 74'.
Eiji