OK here we go:
1,95583 DM = 1 Euro
49,50 DM = 25,31 Euro
Bought in 1983 (lets assume 30/09/83), sold for 623,00 Euro in September 07
Total performance: 2.389,24 %
Average annual return: 14,32 %
I do own this set as well, but unfortunately not MISB and with yellowed parts. X-D
BTW: a simple buy&hold investment in Coca Cola (KO) would have been slightly better with $1.29 on 30/09/83 and $57.47 on 28/09/07, resulting in roughly 4.355,04 % or 17,13 % per year - excluding any exchange rate effects for us Euros. And NO I won't compare with Microsoft, Stryker or Cisco Systems. Go and check yourself! *wub*