Patek Philippe & Co., Genève

damascened nickel lever movement, stamped twice with the seal of Geneva, 18 jewels, mono-metallic compensation balance, precision regulator, adjusted to heat, cold, isochronism and 5 positions, silvered dial, applied arabic and baton numerals, oversized subsidiary seconds, circular two-piece case with screw-down back and angled lugs, case, dial and movement signed, with a steel Patek Philippe buckle, accompanied by an Extract from the Patek Philippe Archives.

The accompanying Extract from the Patek Philippe Archives confirms that this watch was manufactured in 1958 and sold on October 5th the following year.

Patek Philippe commenced production of reference 3417 in 1958. Not all examples of the reference were 'Amagnetic,' the 'Amagnetic' examples employed the calibre 12-400. Since the 1930s, watchmakers  were concerned with adressing the problem of magnetism and used  soft iron dust covers and the addition of anti-magnetic parts, often made out of gold, to achieve anti-magnetism.  As was typical of the caibre 12-400, the present example includes the addition of a gold lever escapement and an iron dust cover. In 1960 Patek introduced the 27-400AM which they would also use on the reference 2570/1, a new Amagnetic model introduced that same year.

For similar examples of Patek Philippe  'Amagnetic' wristwatches, with 'Amagnetic' printed on the dial, see Huber, M., Banbery, A., Patek Philippe Wristwatches, Volume 2, Second Edition, pp.194-195, pls. 311-313. For examples of the calibre 12-400 see, Huber, M., Banbery, A., Patek Philippe Wristwatches, Volume 2, Second Edition, p. 191, pl. 302 a, b.