Ca. Ø45mm, ca. 62g, 18K gold, case and movement with matching number 186104, back lid marked inside ' Made for Tiffany & Co. by Patek Philippe & Co. Switzerland', super thin Ankerchronometer movement of quality 'Extra', Geneva striping, wolf's toothing, adjusted in 8 positions, signed same as the case, gilt dial signed Tiffany & Co. Switzerland, blued steel hands, in very beautiful condition, in working order. Only the best chronometer calibres from Patek Philippe received the quality grade 'Extra' or 'Special'. Patek Philippe delivered these movements to Tiffany, where they were encased in gold cases with matching numbers with the movement.