So, you are looking to source a spare part for a clock. You have given the maker of the clock case but not the movement.
You may well find a complete replacement movement is easiest to obtain, I don't know where on the planet you are but I have used this outfit before:
http://ngclocks.co.uk/
You may consider a REAL clock: thomasmercer.com - just beware; the figure on any tag is not their phone number. It's the price :-)
Acp, August 2017