Note there is no tone control. The cable exits through the strap button, and has been replaced with a modern 'coilcord'. Others I have seen have a 1/4" jack mounted in the top by the volume control. (see pics on pages 47 & 48 of Gruhn & Carter's book 'Electric guitars and basses'. The two extra holes were added later to fasten the tailpiece which had snapped at the bend.