I believe this is operating a similar or same architecture as this historically significant quartz clock time standard:

https://www.rmg.co.uk/collections/objects/rmgc-object-79394

Believe it or not this piece was rescued from being scrapped by my father, who had unique interest in both horology and was a professional electronics engineer. This clock was expertly restored on our family dining table at home - including the build of a new solid state power supply for it. I think the museum still powers up this clock for display, and you can watch the large neon decade dividers doing their thing.

EDIT: appears to have been removed from display according to the linked archive page.