Many decades ago I purchased an unbuilt Sinclair Black Watch kit at an electronics swap meet in California. It is complete except for the two RM 41H batteries that died long ago. I added a screwdriver as the original tuning key was not included - not that it would help. It is unlikely it would work if assembled due to age and history of previous builders lack of long term success. It is an extremely rare kit and belongs in a museum. Make me an offer I can't refuse. https://imgur.com/a/CWt9z1d
That's cool. Yeah... collectors thing for sure. Just not my cup of tea as they say... And I read about the convoluted and sad Sinclair company history just last year...