Paul Prescott It’s the only one I’ve ever seen with a Master stamp. Almost certainly for a padlock too given it’s length, now if he had the padlocks too !! http://www.ebay.co.uk/itm/Victorian-EDWIN-COTTERILL-Key-for-a-Climax-Detector-Lock-Master-Ref-K121-/201362040817?pt=LH_DefaultDomain_3&hash=item2ee21ce7f1
