English gold half quarter repeating pocket watch Circa 1748

Rare pair cased gold pocket watch 
–
A rare English 20K gold pair cased half quarter repeating pocket watch, circa 1748. Gilt full plate cylinder movement, pierced and engraved balance cock with plain 3-arm balance, silver regulation, diamond end stone, two polished hammers striking on an internal bell.
Later white enamel dial, black Roman numerals, black outer minute track with 5 minute markers and later blued steel spade hands.
Engraved inner with pierced sound frets, inner cap, finely engraved outer with pierced and engraved foliate design, push repeat activated via pusher, heavy squared hinge. Movement and inner cap signed, inner case stamped JB
–
Diameter: 48 mm
–
Signed: Benjamin Gray & Justin Vulliamy, London
–
Later dial, hands and bow.