Junghans J8, updated 29.03.2023
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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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, number of teeth | ||
410 | Winding pinion | 10 |
16 | ||
407 | Clutch wheel | 10 |
17 | ||
420 | Crown wheel, upper | 39 |
415 | Ratchet wheel, upper | 51 |
180 | Barrel | 90 |
201 | Center wheel | 12 |
80 | ||
210 | Third wheel | 10 |
75 | ||
224 | Fourth wheel | 10 |
70 | ||
705 | Escape wheel | 7 |
15 | ||
240 | Cannon pinion | 12 |
260 | Minute wheel | 12 |
36 | ||
250 | Hour wheel | 40 |
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J9, number of teeth | ||
410 | Winding pinion | 8 |
16 | ||
407 | Clutch wheel | 8 |
17 | ||
420 | Crown wheel, upper | 35 |
415 | Ratchet wheel, upper | 60 |
180 | Barrel | 96 |
201 | Center wheel | 12 |
80 | ||
210 | Third wheel | 10 |
75 | ||
224 | Fourth wheel | 10 |
70 | ||
705 | Escape wheel | 7 |
15 | ||
240 | Cannon pinion | 12 |
260 | Minute wheel | 10 |
32 | ||
250 | Hour wheel | 45 |