Hello CyberJack,
It's given me massive joy and endless fascination to the extent it's made me glad to have been born.
Here is one I got recently and installed in earnest to my trusty Laser. I just can't help myself. It's an obsession -or a disease.
The second pic is one made in 1978 I got on Gumtree recently and applied clear to the Hubodometer crystal to make it extra clear to see though. Looks great.
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!
