English half-quarter repeater with stoppable seconds Circa 1787

Important pair-cased watch with early cylinder escapement 
–
An important pair-cased half-quarter repeating pocket watch with an early cylinder escapement and stoppable centre seconds, circa 1787. 18k pink gold case, polished, tiered, a goutte, case maker’s punch mark IM (Jonah Mince), signed movement protection cap with enamel dial, Roman radial hours, centre seconds, gold poker & Beetle hands, full plate movement, keywind, fire gilt, signed, applied florally engraved ornaments, chain/fusee, conical movement pillars, fine steel cylinder wheel, cylinder escapement, three-arm steel balance, engraved pierced balance cock with mascaron, set diamond endstone on balance.
–
Diameter: 55 mm
–
Weight: 169 g
–
Signed: Tho. Mudge & W. Dutton London