Hello Silver Searcher, my name is Jack van Otterloo and Iám from the Netherlands. It's a very nice key you found, personaly I think it's a little bit later. The model of the bit showes that it has to be dated round 1200. Is it possible to send me some more pictures of this key ? Perhaps I can tell you some more about the history off this key. many thanks Jack. my emailadress is [email protected]