I came across this clock key for sale on eBay apparently for a clock manufactured by "Wales & McCulloch". They seemed to be a London-based firm with a shop at 20 Ludgate Hill. I haven't yet managed to track down who this McCulloch was or where he came from so it's still an unsolved mystery! Any further information about Wales & McCulloch would be gratefully received. And yes.. I did buy the key :) EDIT: Added a few other beautiful items made by W & M also below.
Pair of antique silver caviar trays in original box by Wales & Mcculloch
A yellow metal Egyptian style brooch, with scarab beetle type insert in fitted case for Wales and McCulloch