Croy was so attracted by the skilled workmanship that he acquired the entire lotnearly four hundred of them.
Nothing more was known.
It is believed that Fritz made these models during the 1950s and 1960s, based possibly on existing buildings.
Designboom speculates that the models could be part of an extensive model train set that perhaps Fritz was building.
The collection has been exhibited at various locations around Europe the past two decades.
It now resides in the Wien Museum, Vienna, Austria.
