Junghans J82/3 (682.73)
Description
The Junghans 82/3, the chronometer version with hacking function for the center seconds of the already very high quality base caliber Junghans 82/1 is certainly one of the pinnacles of German watchmaking.
With a diameter of 12 1/2 lignes (other sources report 12 lignes), it is quite large, and therefor can offer a large mainspring barrel and balance wheel to achieve great precision.
base plate
You will instantly recognise the red golden color of the movement, which offers a beautiful contrast to the dark red rubies in all important bearings.
Since it is an officially certified chronometer, the movement has got a serial number, and its hallmark “F5” says, that it was already made in june 1955, which makes it an early speciman.
During its production run, over 30,000 pieces were produced, completely overwhelming the testing institutes. Junghans was the third-largest chronometer producer in the world after Rolex and Omega during this period!
gear train
The gear train couldn’t be more classic; it’s clear that no risks were taken here.
The large, yellow-gold barrel directly drives the central minute wheel, followed by the third wheel, seconds wheel (at 6 o’clock - there were also versions of this movement with an decentral seconds indication at this position), and escape wheel.
The escapement, of course, is a Swiss pallet lever escapement.
side view of the gear train
The large, two leg Glucydur screw balance is mounted in two in-house Junghans II shock protections and beats slowly with 18000 A/h.
Adjustment is achieved using an in-house fine adjustment mechanism, a swan neck, which acts on a sector-toothed lever.
inside the gear train bridge
A special feature of this very tall movement is the way in which the indirect central seconds hand is implemented:
The third wheel simultaneously drives the seconds wheel and the central seconds pinion, which runs in a lowered bearing of the gear train bridge. A friction spring underneath ensures that it does not flutter or jump. This construction was patented by Junghans in 1952.
side view with center seconds pinion
A bezel-set capstone is mounted on the top of the central seconds pinion, a visual feast for the eyes!
Junghans J82/3: Dial side
On the dial side, you see “only” the three-leg shock protection of the balance, and the rugged yoke winding system.
In the lab
Timegrapher result
Even after 70 years, this movement runs in all positions within the COSC chronometer specs. Fantastic!| horizontal positions | |||
|---|---|---|---|
| dial up | +4 s/d | 306° | 2.2ms |
| dial down | +-0 s/d | 304° | 2.2ms |
| vertical positions | |||
| crown right (12 up) | +1 s/d | 282° | 2.5ms |
| crown up (3 up) | +-0 s/d | 250° | 2.4ms |
| crown left (6 up) | +-0 s/d | 289° | 2.6ms |
| crown down (9 up) | +6 s/d | 250° | 2.7ms |
Technical data
| Manufacturer: | Junghans |
| Caliber: | J82/3 (682.73) |
| Caliber base: | Junghans J82/1 |
| Size: | 12 1/2''' (measured: 28,0mm) |
| A/h: | 18000 |
| Number of jewels: | 17 |
| Escapement: | Pallet lever |
| Balance types: |
Glucydur screw balance (two legs) |
| Shock protection(s): |
Junghans II |
| Balance bearing / direction hairspring: | Clockwise |
| Moveable stud: | no |
| Construction: |
|
| Construction type: | solid construction |
| Winding mechanism: | yoke winding system |
| Setting lever spring: | 3 hole(s) |
| Attachment of setting lever: | screwed |
| Features: |
|
| References: |
Feilner: Bl.36 2753 Flume: 1957 37 |
| Mentioning in literature (years): | 1956 - 1959 |
| Production years: | 1954-1960 |
| Inventory number: | 24007 |
Usage gallery
Junghans Chronometer gents watch