Just realised, the mark under the twin f's is the design number of the clock in your picture, 1244. Thanks again.
I think you've nailed it! I think the mark has two stylized 'f's for Formaintraux Freres. There is a piece on Etsy and another on eBay with the...
Got this at an auction recently. I took the movement to a clock repairer who dated it 1890-1910 but unfortunately can't repair it. I've checked...
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