E. Gompers, Threadneedle Street, London, "Chronometer", Movement No. 12538, 50 mm, 135 g, circa 1874

A solid pocket chronometer with rare English pivoted detent chronometer escapement
Case: 18k gold, case maker's punch mark "JR". Dial: enamel. Movm.: full plate movement, keywind, chain/fusee, gold screw chronometer balance, freesprung blued helical balance spring.