IWC
Calibre 81905
Manual winding
Specifications
- Maker
- IWC
- Type
- Manual winding
- In-house
- Yes
- Power reserve
- 84 h
- Frequency
- Not found in sources
Sources
- Official IWC retrieved October 16, 2026
Used in
| Watch | Ø | Thickness | Lug-to-lug |
|---|---|---|---|
| IWC Schaffhausen Portugieser Hand-Wound Tourbillon IW545801 | 42.4 mm | 10.8 mm | — |