Lot No. 722 (91st Auction)
A. Lange & Söhne, Glashütte B/Dresden, Movement No. 92307, Case No. 92307, Cal. 47, 62 mm, 196 g, circa 1934

An important Glashuette half seconds beating deck chronometer with pivoted detent chronometer escapement and helical balance spring, regulated by Paul Thieleman and sold to Gustav Milkuhn, Königsberg on December 28, 1937 for 555 reichsmarks - this is one of the very few half seconds chronometer with screwed gold chatons up to the centre wheel - manufactured in quality 1A - with Lange extract from the archives
Case: silver, polished, case design "Jürgens". Dial: silvered, radial Roman hours, auxiliary seconds, 32h power reserve indicator, numbered, signed, blued spade hands. Movm.: 3/4 plate movement, frosted, gilt, signed, screwed gold chatons, Grossmann's pivoted detent chronometer escapement with 2 screwed gold chatons, nickel steel screw compensation balance, freesprung blued helical balance spring, very fine florally hand-engraved balance cock, gold escape wheel, chatoned diamond endstone on balance.

Pocket chronometers with barrel
Pocket chronometers are considered to be the precursors to deck watches. Lange & Soehne originally produced pocket chronometers with going barrels for scientific purposes. Often set in wooden boxes, they were to be used as deck chronometers on ships. Following this style the watches were designed with 14,400 alternations per hour; as a result the second hand was able to jump every half second. The watches all have pivoted detent escapements, which were designed in two different styles: one version was the chronometer escapement according to Berthoud, the other the escapement according to Julius Grossmann, which had an additional safety lever to prevent the escapement wheel from going on once the balance had been taken out.
Estimate  40,000 - 50,000 €
This is a lot of a former auction!

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