One document about the special edition of a 750 with 28.5 cm longer chassis made by Hamco
http://www.italo-dance.de/E32-Forum/Hamco.jpg
Price range in 1988 was between 190.00-450.000 Deutsch Mark, which is approx. 100.000 - 225.000 EURO, although of course at that time it was much more money/value.
