Junghans J8, updated 12.03.2022 - Helicopters, pocket watches, flight simulation, tools.

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Junghans J8, updated 12.03.2022

Junghans
Qualitywatch
1908-1909
Schramberg
Open face
J8
not mentioned in any catalog
18'''
42 mm

5 mm
18000 A/h
36 h


2 x 15,5 x 0,2 x 460 mm
42°
11





35 g
None to my knowledge

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Power reserve:
Balance staff:
Stem:
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Hour hand:
Minute hand:
Seond hand:
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Reference picture:
Junghans J8 rediscoverd 2017
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J8 first series-produced pocket watch
This is an early J8 from the first batch with serial number 2543. Pictures courtesy of Bernd Küpper. The case, dial and hands are all original and the movement has only the number engraved.
J8
J8
J8, serial number 11831, from the second batch, now with Junghans engraving on the movement.
J8
J8
J8, serial number 11935, from the second batch, now with Junghans engraving on the movement.
J8
J8
Junghans archive movement list J8 entry.
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The first series-produced pocket watch by Junghans.

A hint in the magazin "Die Uhrmacherkunst" 1923 Nr. 8 page 91:

"1908 erschien "J8" die Qualitätsuhr, eine 18''' elfsteinige Uhr mit aufgebogener Spirale, die auf +- 20 Sekunden hängend und liegend regulierte. Diese Uhr, die in Posten von je 10000 Stück hergestellt wurde, war die eigentliche Lehruhr für die Massenerzeugung. J9 war eine 15 steiniges Brückenwerk mit aufgebogener Invar-Kompensationsspirale und Nickelunruh."

“In 1908 the “J8” appeared as a quality watch, an 18''' eleven jewels with a curved up spiral, which was adjusted to + – 20 seconds, suspended and lying. This clock, which was produced in batches of, 10000 pieces, was the actual training clock for mass production. J9 was a fifteen jewels bridge movement with a curved up Invar compensating spiral and a nickel balance.”


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J8
J8, number of teeth
410Winding pinion10


16
407Clutch wheel10


17
420Crown wheel, upper39
415Ratchet wheel, upper51
180Barrel90
201Center wheel12


80
210Third wheel10


75
224Fourth wheel10


70
705Escape wheel7


15
240Cannon pinion12
260Minute wheel12


36
250Hour wheel40
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J9, number of teeth
410Winding pinion8


16
407Clutch wheel8


17
420Crown wheel, upper35
415Ratchet wheel, upper60
180Barrel96
201Center wheel12


80
210Third wheel10


75
224Fourth wheel10


70
705Escape wheel7


15
240Cannon pinion12
260Minute wheel10


32
250Hour wheel45
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