Need to get pics but a friend of mine has an old Bonney ring spanner that has been reshaped to do a specific job on the landing gear of the ww2 Lancaster bomber, (belonged to his grandfather iirc) or so the story goes
Not particularly useful these days, but a nice conversation piece,
One i modified/made was a custom low profile hex ratchet out of a 10mm ratchet spanner and a 7mm hex bit to undo the 7mm hex bolt that holds on the rear calipers on Volvo xc90's and a few other vehicles, (going to be making a new better one as it worked out well despite using the cheapest ratchet spanner i could find...)