1969 Gibson EB0 Short Scale Bass

Really rare and interesting Gibson short scale bass. Serial number dates it to 1969 and it's in amazing original condition with intact factory mute and original pots. 
However, can't find another short scale EB0 with the second bridge pickup. If it's aftermarket it's very old and must have been installed when the bass was near new. 
So light and easy to play with a huge sound.