Junghans J15

Kind:
Master watch
Production:
1914 - 1925
Production site:
Schramberg
Type:
Hunter case
Variants:
J15
Catalog Group:
106
Size:
19'''
Outer Diameter:
43,6 mm
Nominal Diameter:
43,0 mm
Height:
5,0 mm
f:
18000 A/h
Power reserve:
34 h
Balance staff:
U409
Stem:
W298
Junghans mentions 3 different stems
with 23,75 mm, 25,4 mm
and 26,4 mm length
Mainspring:
Zf3495, 460 x 16,0 x 2 x 0,20 mm
Junghans mentions spring
number 1002 465 x 2,0 x 0,20 mm.
Liftangle:
38°
Jewels:
15
Hour hand:
Ø 1,85 x 20 mm
Minute hand:
Ø 1,15 x 14 mm
Seond hand:
Ø 0,21 x 7 mm
Distance Center to Fourth wheel:
11,7 mm
Dial feet position:
CW 33,9 mm
FW 22,5 mm
CW 30,7 mm
FW 49,0 mm
Movement weight:
47,1 g
Reference picture:
F.W.S 1942 page 18

 

 

Junghans catalog 1914

Hunter case Junghans "Master" Watch, 15 jewels, cut compensation balance, hardened Breguet steel hair spring, lever escapement with visible jewels, steel escape wheel, double safety roller, gilt plates gold or silver.
The watch will come with the factories certificate of warranty.
Junghans catalog 1915

We hereby beg to bring to your notice an Expert opinion given by the Director of the Observatory of the Royal Technical High School of Berlin-Charlottenburg, who writes as follows:
A Watch which was selected from a number of others showed a reliable finish in movement and especially in the Lever.
Comparisons showed an excellent result compared to Watches of well known manufactures.
This Watch must therefore, apart from its reasonable price, be considered as high-class, satisfying all the requirements of a serviceable article and which can safely be compared to any first-class Watch of the highest reputation on the Market.
Junghans catalog 1923

Although we commenced watch manufacturing at a comparatively recent date our watches have already, owing to their high quality and reliability, gained a world-wide reputation. Our method is: Utmost precision in the production of all parts, ruthless removal and destruction of all parts which are found to be in the least faulty or inexact, assembling, examination and regulation by proved experts. This system ensures equal high quality of all our watches and absolute interchangeability of all parts.

Page 12
Watch Movement No. J15, is adjusted in different temperatures, hanging and lying, down to a few seconds, 15 jewels, cut balance, Breguet steel hair spring, lever escapement with visible jewels, double safety roller, gilt plates.

Page 19
Master Watch
Movement No. J15 with 15 jewels, cut compensation balance steel Breguet spring, lever escapement with visible jewels, double safety roller, gilt plates.

Case: White metal or black oxidised steel, silver 0,800 or 0,900, or silver with gilt rim 0,800, or gold plated
Dial: White enamel dial with sunk centre,
Bow and crown: If white metal cases: white metal
if steel cases: white metal or gilt
if silver cases: silver.

106/1 19''' - White metal plain
106/10 19''' - Oxidised steel
106/20 19''' - Silver 47 1/2gr
106/30 19''' - Silver with gilt rim 50gr
106/40 19''' - Gold plated
106/58 19''' - Inside dome gold plated