The Gronefeld Principia is a beautiful watch indeed , love the way you can configurate the watch in your fav combo . Still the 1941 is my fav from the brand . And the Urwerks are just so cool to look at . The cobra is a Classic allready and the 111 ...... no words for this amazing watch .
2 Gronefeld listings are live on the eBay market and 11 collector listings on the WatchProSite marketplace.