Junghans J8, updated 06.03.2020 - Helicopters, pocket watches, flight simulation, tools.

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Junghans J8, updated 06.03.2020

Junghans
Qualitywatch
1907
1908-1909
Open face
J8
18'''
42 mm
5 mm
18000 A/h
36 h
?
?
2 x 15,5 x 0,2 x 460 mm
None to my knowledge
50 x 70 mm
35 g
74 g
42°

Kind:
Development:
Production:
Type:
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Size:
Diameter:
Height:
f:
Power reserve:
Balance staff:
Stem:
Mainspring:
Reference picture:
Case size:
Movement weight:
Weight complete nickelled case:
Liftangle:

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J8 first series-produced pocket watch
Junghans J8 rediscoverd 2017
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 an 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 an curved up Invar compensating spiral and a nickel balance."


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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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