A mid 19th Century Swiss verge alarm in a silver gilt open face case. Full plate gilt keywind fusee movement, plain cock with garnet endstone, blue steel regulator. Plain three arm gilt balance with blue steel spiral hairspring. Alarm train with small, partly visible blue steel mainspring, single polished steel hammer striking a bell. White enamel dial with subsidiaries for seconds and alarm set, Roman numerals, blue steel hands. Engine turned silver gilt open face case with ribbed middle, flat crown to allow the alarm to be set. Opening the back cover reveals the engraved and pierced inner dome to allow the bell to be heard clearly.