Junghans 684.12
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| Junghans 684.12 |
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Description
The Junghans caliber 684.12 is a true "Master" (english translation of "Meister") piece.
Construction-wise it is more or less a very little simplified caliber 685, which was the
last Junghans chronometer movement.
You can easily spot the relationship to this chronometer movement by its large
Glucydur balance, which is beared in the characteristic Junghans shock protection
system with their extra large cap jewels and which is here adjusted by a swan-neck
regulator. Additionally, the anchor wheel is beared on top in a chaton with
cap jewel, secured by a KIF Duofix protection.
The center second and minute hands are driven directly - a very classic construction,
and this really interesting: Since the movement nowhere shows signs of a modern
construction, it was easily transformable into a true chronometer movement - the caliber
685.
On the dial side, there are no surprises, too: The date advances slowly (while the last
part even slips very slow to the following day) and can be corrected in a semi-fast manner
by advancing and turning back the crown. And the common yoke winding system shows a decent
level of quality.
The caliber 684.12 shown here bases on the simpler caliber 684.00, but contains a date
indication, is golden colored and contains a swan neck regulator. The signature "E5"
below the balance indicates it production date, may 1965.
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| dial side view |
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Technical data
| Manufacturer | Junghans |
| Caliber | 684.12 |
| Number of jewels | 17 |
| Escapement | Anchor with pallets |
| Balance | Glucydur |
| Shock protection(s) | Junghans |
| Balance cock direction | clockwise |
| Hairspring stud | fixed |
| Regulator type | Swan neck |
| Movement construction | Fork
Escapement wheel, Fourth wheel, Third wheel
Center wheel
Mainspring barrel |
| Features | SCD,QG,RDR |
| Functions | Hour, minute, second, day |
| Beats per hour | 18000 |
| Size | 11''' |
| Image in Flume Werksucher | K3 - |
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| Factsheet |
Usage gallery
