Non Magnetic Bahne Bonniksen

Non Magnetic Bahne Bonniksen, Coventry, No. 62873, with Chester hallmarks for 1897. Very fine and rare 18K gold, keyless "non-magnetic" pocket chronometer with 52 1/2- minute Karrusel regulator. Four-body, "bassine et filets", polished. Hinged goldcuvette. By Graff, white enamel with radial Roman numerals,Outer minute track, sunk subsidiary seconds. Blued steel "Spade" hands. 18’’’, frosted gilt, three-quarter plate, 15 jewels, going barrel, pointed tooth lateral lever escapement, cutbimetallic balance with gold screws, Palladium balance spring with terminal curve, index regulation, ruby endstone.Bonniksen 52 1/2-minute Karrusel regulator.Stamped with the Bahne Bonniksen patent mark on the pillar plate.Diam. 55 mm. Notes Bahne Bonniksen (1859-1935) is listed as working at 16 Norfolk St., Spoon End, Coventry. Bonniksen was born in Denmark and completed his horo-logical apprenticeship under T. D. Wright in London, Wright was later appointed lecturer at the Northampton Poly-technic, London for his work on the theory of chronometer manufacture. After completing his apprenticeship Bon-niksen moved to Coventry where he set up his workshops. In 1893 Bonniksen made an application to the British Patent Office for his Karrusel regulator, in November of the same year he was granted Patent No.21421 for this invention. At the height of production, watches with his regulator were made under licence by several watchmakers in Coventry and no less than 500 watches per year with Bo