Clock of the day

This item is interesting for the movement. It is a "TSOL 1", the product of an unknown British manufacturer. I have seen several of these clocks over the years so they seem to be quite prolific. However I have so far been unable to identify the maker... I wonder if any of you know the history of the TSOL1? The unusual steel mountings appear to be original, as I have seen two or three clocks with these same steel mounts. The pendulum bob is solid lead and uncoated, and the plates and wheels are massive. I'm certain that this movement could drive very large hands. It may have been intended for dial clocks in the early post-fusee period, and surplus movements may have been sold to mantel clock manufacturers. I can't think of any other reason why ordinary looking mantel clocks would have such huge timepiece movements.

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