apollo 17 medallion set valuation

[roeloffs]

I am in posession of an apollo 17 commemorative medallion set and want to know what it's value is and if there are any buyers or where one may go to sell the set. The set is in the original case and untouched in every way. the pieces are 8g solid gold 999.9 pure 24 K and there are seven pieces, Apollo 1,2,3,3,4,5,6 moon landing medallions
Photos are available as needed.
the set was purchased new from:
Verlag Internationaler Gedenkmunzen
Hanselmannstr. 13
8 Munchen 40
Does this place still exist? How would one get in touch with them or another buyer/seller of these items.
Anxiously awaiting a reply and much thanks in adevace
KURT roeloffs
kwr1@optonline.net
516-551-2000 (USA)