Junghans timing watch, movement J28 - Helicopters, pocket watches, helicopter flight simulation and more.

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Junghans timing watch, movement J28

Junghans
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Timing Watch
1955 - 1962, 628 1962 - 1989
Open face
28, 28/1, 28/2, 28/11, 28/20,
628.00, 628.01, 628.02, 628.11
19'''
48,8 mm
10,0 mm
1/10 sec. = 36000 A/h
1/100 sec. = 360000 A/H
U2340
W1819

F.W.S 1972 page 111
55 x 76 mm
101g
Stoppwatch made since 1955, 1962 Junghans renamed their movements and the new name for the J28 was now J628 which makes this one built after 1962.

Junghans catalog 1956 text:

Stop Watch 1/10 seconds, with three-circle dial, 7 jewels, jewelled pallets, shockproof, metal case, Start stop and back to zero by successive pressures on the crown, chromium plated metal case 55 mm ø, metal dial.
The 3 advantages of the Junghans Stop Watch 1/10 seconds with Three-circle dial are:
1. Reading made easier by 3 separate dials for minutes, seconds and 1/10 seconds. Avoids hands to be on top of each other.
2. Reading more exactly as the 1/10 seconds hand always stops accurately on the stroke of the scale.
3. Greater exactness as without zero setting fault and without dial fault (no stopping in between strokes)

J28/11 1/100 second, 15 jewels, "Meister"
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These pictures of a Junghans J28/20 "Worktimer" timing watch are courtesy of Deutsches Uhrenmuseum Furtwangen. I could not find any further information of this J28 variant as it is not mentioned in the normal references.
Picture courtesy of Deutsches Uhrenmuseum Furtwangen
Picture courtesy of Deutsches Uhrenmuseum Furtwangen


Extract from the Junghans Stopwatch brochure 1965.

Stopwatch with Three-Circle Dial


Accuracy:

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Advantages:
1/10 sec.

Accurate recording of single processes.

Presision movement with jewelled pallets, 7 or 15 jewels, Balance shockprotected, Nivarox hairspring, antimagentic and independent of temperature variations, barrel with maltese cross stop work, unbreakable mainspring. Balance oscillations are transmitted directly to the 1/10 seconds recording hand, thereby eliminating inaccuracies.

Particularly reliable through hardened steel components and breakproof springs.

Chromium-plated metal case, 55 mm diameter, protected against spray water.

Sprayed white metal dial with three seperate, graduated circles for minutes, seconds and thenth of a second.

60 minutes.

The watch is supplied in a handy artificial leather pouch.

Starting, stopping and return to zero controlled by pressing crown. The stop watch is wound by turning the knurled crown.

Reading made easier by three seperate dials. Hands cannot stop on top of each other. Reading more accurate as reading marks are distinctly spaced and the 1/10 seconds hand always stops exactly on a mark.
Greater accuracy. Each oscillation of the balance is recorded by a distinctly perceptible move of the 1/10 seconds hand. Zero-setting faults and dial faults which influence the timing result are eliminated.


The 1/10 seconds variant with 15 jewels were also available as "Officially tested "Meister" stop watch" with engraved number on the outside of the back. This watch has been tested by the "Physikalisch-Technische Bundesanstalt" and is delivered with a official certificate. Chromium-plated metal case, 55 mm in diameter, spray-water protected, precision jewlled lever movement, 15 jewels, gold-plated plates, shock-resistant, anti-magentic Nivarox balance-spring which is independent of temperature variations, unbreakable mainspring. Construction and performance of the "Meister" stop watch guarantee a timing accuracy which fullfills the requirements demanded by international contest regulations for the recognition of championship records.
Zulassung von Stoppuhren mit Handtätigung zur Eichung. Amtsblatt PTB Nr. 2/1960 Seite 128.

Junghans J28, 7 Steine, Zulassungsschreiben vom 25.7.1960, PTB Gesch.-Nr. 9270/59 I A/U 3. Ang.
Zulassungsbezeichnung 121 301e

Junghans J28 Meister, 15 Steine, Zulassungsschreiben vom 2.5.1961, PTB Gesch.-Nr. 1946/61 I A/U
Zulassungsbezeichnung 121 302e



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