Silver Champleve Dial Verge with Enamel

An early 18^th Century continental calendar verge with silver champleve dial in repousse silver pair cases set with an enamel scene.  Deep full plate fire gilt movement with decorative baluster pillars.  Fusee and chain with worm and wheel barrel setup between the plates.  Winding through the pierced and engraved bridge cock, pierced and engraved plate for the silver regulator disc. Plain gilt balance with blue steel spiral hairspring.  Silver champleve dial with arcaded minute ring, Roman and Arabic numerals.  Silver centre signed "Decour - London", rectangular date aperture, decorative pierced gilt hands.  Plain silver inner case, maker's mark "IR" below a crown.  Chased and engraved silver repousse outer case with cartouches of busts and animals.  In the centre of the back a fine polychrome enamel circular plaque depicting a classically dressed couple.