I just posted a 3 day auction on EBAY for one of the rarest and most unusual
LEGO items found anywhere, a 1961-65 continental European Lego Retailer
Windows/Doors Boxes (#214 1-10).
These boxes were used by LEGO retailers in continental Europe to sell individual
classic windows and doors to children (and adults).
These boxes were not generally sold to the public, and few survive from the
1960's. This one is empty.