Ca. Ø51mm, ca. 115g, 18K pink gold, case number 201612, dome marked 'Fabrication Speciale pour Mascort & Bonturi', top class Ankerchronometer, No.333118, especially large chronometer balance, special and highly refined chronograph with polished and bevelled steel parts, perfectly preserved, extremely rare enamel dial with red production counter, pink gold hands, in working order and in very good condition. The watch was ordered by the V & C agent Carassale and was a special order for Mascort & Bonturi. Mascort & Bonturi was a fashionable fine clothing shop in Buenos Aires. Chronographs with production counters are extremely rare. We know of no other Vacheron & Constantin chronograph with this dial. The indication on the dome shows that it was a special production for the man's outfitter, to measure the number of pieces in certain production runs. The counter starts with 90 and ends with 12, which means 12 pieces per minute. The division is accurate to 1/5th of a second! The extract from the archives confirms the engraving and suggests that it is probably a unique piece!