Jon from Stereolalab who sold the derailleur on ebay.
I've been collecting road bike groupsets from the 80's and 90's for a few years, the rarer the better, Galli aerodynamic KL, Gipiemme Crono Special, Cambio Rino Elegant, Mavic ZAP, Suntour Superbe Pro, Dura Ace AX and stuff like that. But...