A fine large early 20th Century English tourbillion in a silver open face case and deck box. Gilt half plate keyless movement with going barrel. Rare flying 6 minute tourbillion carriage rotating once every six minutes. Plain cock with diamond endstone. Compensation balance with freesprung blue steel overcoil hairspring. English table roller lever escapement. Screwed in jewelling, escape and lever pivots with endstones. Signed white enamel dial with subsidiary seconds, Roman numerals, blue steel hands. Substantial plain silver open face case with gold hand set, hinge and thumb pieces, gilt winding button, silver bow. Maker's mark “W.B” in a rectangle and number corresponding to that on the movement. Fitted in a three tier mahogany deck box with brass furniture, signed and numbered circular bone plaque on the lid. Two spare flat glass crystals.