Junghans Pocketwatch, movement J9 - Dirk E. Fassbender

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Junghans Pocketwatch, movement J9

Junghans
Quality watch
1910 - 1914
Open face
several changes in parts
104
18,5''' and 19,5'''
42,1 mm and 44,6 mm
41,45 mm
5,1 mm
18000 A/h
34 h
U408, DCN179, RONDA1301
W297, DCN167, RONDA2273
Junghans mentions 3 different stems
with 22,5 mm, 23,75 mm
and 25,0 mm length.
Zf3495, 460 x 16,0  x 2 x 0,20 mm
Junghans mentions spring
number 1002 465 x 2,0 x 0,20 mm.
F.W.S 1947 page 74
35g
85g
67g

Junghans catalog 1914 text:
Quality Watch, compensating hairspring, lever escapement with visible jewels, double safety roller, gilt plates in gold and silver.
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The first used set spring assembly.
This is the second used click spring assembley also with a new escape wheel bridge.
This is the newer type set spring.
Kind:
Production:
Type:
Variants:
Catalog Group:
Size:
Outer Diameter:
Nominal Diameter:
Height:
f:
Power reserve:
Balance staff:
Stem:



Mainspring:


Reference picture:
Movement weight:
Weight complete, nickel case ø 51mm:
Weight complete, silver case ø 48mm:
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This is the oldest used click spring assembley with the first used escape wheel bridge.
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I have seen several J9 movements with a split barrel bridge.
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This is the latest used click spring assembley used.
A combination of bigger main plate and split barrel bridge.
Several once with a bigger main plate.
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Also in silver plated and with a special design.
J9, number of teeth
410Winding pinion10


18
407Clutch wheel10


15
420Crown wheel, upper30
415Ratchet wheel, upper43
180Barrel70
201Center wheel10


64
210Third wheel10


64
224Fourth wheel8


60
705Escape wheel6


15
240Cannon pinion10
260Minute wheel8


30
250Hour wheel32
The picture to the right shows the "J9" board watch in the cockpit of a Zeppelin-Staaken VGO I. Picture courtesy of Sammlung Peter W. Cohausz.
One possibility for the bigger main plate is the usage in a board clock.
Pictures courtesy of Oliver Jordan www.deutscheluftwaffe.de
Part chart from 1913, courtesy of JUNGHANS GMBH & CO.KG
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