Somebody knows... Maybe you?
Seems crazy to me that Bryans would have dumbed down a Clock mech themselves like this. Forgetting the major part of the mech which is the "Tick-Tock" to replicate a real clock, there is the complication of the two hands running with both stopping on 12 for a jackpot. I can't believe Bryans would build all that mech and then not add the other hand!? And how do you know you were supposed to win a jackpot or not with only one hand?? Makes total sense though that this Glenvil was either offering the conversion or likely doing it himself. There were obviously tons of boring Clocks floating around England that had been in the market forever so a change like this would add some new life for sure.
I did buy a spare one I think at a previous Coventry auction. Can try and get a better scan, I was going to do a cleaned up one in photoshop as well..