The previous (and 1st) owner sent me the original bill of 'the Blacky' through post. Super cool.
It mentions 13 december 1975 as the date that the original owner took delivery of his "Presto Tour Special". Also specced: Black with silver headtube, chrome fork, frame# 2038. Not specced are the components. They are summed up on an attached piece of paper. The bike was purchased for 1498,50 guilders.