IWC started making calibre: 83 about 1930. It was made up to 1947. In 1943 it was upgraded with inca shock protection. The design is essentially a downsized pocket watch movement. The crown and ratchet wheel is placed under the bridges.
IWC Calibre: 83
- Made approximately: 1930-1947
- Made in Switzerland
- Power reserve 47h
- 15 Jewels
- 18000 B/A
- Lift angle 52°
- DM 26.5mm
- H 4.1mm
The movement bridges are finely finished with Geneva stripes and angled edges. The jewels are set in chatons. The the traditional click has been replaced with one piece of spring steel that allows the ratchet wheel to move in one direction. It might not be the finest of solutions, but it was innovating for 1930.
Surface finish on top side of the plate and bridges: 9 Points
Surface finish on screws: 10 Points
Surface finish on crown and ratchet wheel: 7 Points
Movement Jeweling: 6 points
The movement has a pretty standard sub-seconds layout.
Movement design innovation (for ca 1930): 7 points
The IWC base plate dial side has a fine perlage finish on both the dial side and gear train side. Winding mechanism is well made with no wire springs present and polished screws.
Base plate finish: 9 Points
Setting and winding mechanism: 9 Points
Gear-train finish: 8 Points
Movement durability: 7 Points
The last models had Inca shock protection.
Potential bonus points: 3
Accuracy: 9 points
Power reserve of 37 hours is acceptable
Power reserve: 7 Points
IWC calibre: 83 points summary:
Surface finish on bridges and top side of base plate: 9
Surface finish screws: 10
Surface finish on ratchet and ratchet wheel: 7
Movement Jeweling: 6
Movement innovative design for ca 1930: 7
Total bonus points: 0-3
Base plate finish: 9
Setting and winding mechanism: 9
Gear-train finish: 8
Movement durability: 7
Accuracy: 9
Power reserve: 7
Grand total: 88-91*
*If it has extra bonus points