This is key 131 very nearly finished, Recently I saw a lovely old key sold on Ebay for hundreds of $ it was made by Lindholm and Wikstrom there is also a good write up and pictures in the Telegraph Office Info and three small original pictures below And I've tried to make a G3YUH version of it, Not a replica or even a copy but I hope to capture the essence of it, and also incorporate some additional extras to enhance it's performance if that's possible :()
I have already made some slight changes to the original design, the block is a slightly different shape and  includes my favourite 7mm mini ballraces with their almost frictionless performance they really enhance a keys action, the ends of the holder are tapped to M8 and threaded slugs have been screwed in to gently press on the bearings to hold them in place and  locked  with knurled rings, I have added a vintage patina finish to the brasswork and the knob is a different shape but I have seen similar teardrop knobs on these keys, just requires contacts and a few minor adjustments, it has a fine long lever action and it's been real fun to make