English 18k gold centre seconds tourbillon watch Circa 1878

Gold watch with one minute tourbillon, centre seconds and power reserve
–
A very rare English 18 carat gold open faced centre seconds pocket watch with one minute tourbillon and power reserve indication, circa 1878.
English precision movement with one minute tourbillon, chain and fusee, key winding.
Original white enamel dial with Roman hours, 30 hours power reserve indication, stoppable centre seconds and blued steel hands.
Engine turned case, relief rim, lateral button to stop the seconds, English Hallmarks for 1878, casemaker’s punch TR. Matching numbers on dial and movement.
–
Diameter: 55 mm
–
Weight: 146 g
–
Signed: No name