http://www.ebay.co.uk/itm/Custom-Built-Hofner-Left-Hand-Acoustic-Bass-Guitar-/222152876319?hash=item33b957e11f:g:g~MAAOSwvg9XYBIv
It's not a "custom left-handed acoustic bass", it's a right-handed neck from an old violin bass glued to the body of a semi-acoustic guitar. Apparently it's "left-handed" because it's been strung that way.
God knows where the scale length has ended up, or whether the intonation actually works.
The parts used may well be from 1963/64. They could equally well be from almost any other year in a 20-year period.
Run away!