Irish Silver Pair Cased Verge

A late 18^th Century Irish verge in silver pair cases.  Full plate fire gilt fusee movement with round pillars.  Pierced and engraved masked cock, engraved foot and plate for the silver regulator disc.  Plain three arm steel balance, blue steel spiral hairspring. White enamel dial with Roman numerals, Arabic numerals at the quarters, fine gold cathedral hands. Matching silver pair cases, silver pendant and bow, maker's mark "JB".  The inner case with unusual recessed shutter to the winding aperture.