Per Google lens search, fits size shape and coloring of a late 18th century model Singer 12k fiddle base hand crank sewing machine. It’s mounted to an oak block with hinges to lift and access compartment under fiddle base. Oak block dimensions approx 22 inches by 11 inches by 2inches . Original gold details visible and 75% clear condition, metal seal attached, seems to have all original parts however has been left in old basement and most metal pieces are slightly encrusted with rust

Unknown but unlikely