This listing features a collectible mechanical chess clock by Koopman. It is a piece of significant historical value, dating back to the late 1940s, and remains in fully functional technical condition.
Currently, this is the only model of this specific type available for sale on the global online market.
Technical Condition & Operation
The clock is fully functional. The mechanical movement runs smoothly, and the lever mechanism switches without seizing. The visual condition and the precise operation of the movement are demonstrated in the video.
History & Provenance (UDG)
This specific example carries a documented history that distinguishes it from standard auction items:
- Dating: The bottom of the case features an original factory stamp indicating the warranty expiration date: 1952. This strongly suggests the clock was manufactured in the late 1940s.
- Ownership: Next to the stamp, there is a hand-written marker inscription reading "UDG". This abbreviation stands for Utrechts Dam Genootschap (Utrecht Draughts Society) – a historic strategy game club in the Netherlands.
Product Specifications
| Manufacturer | Koopman (Dordrecht, Netherlands) |
| Production Era | Late 1940s (Warranty stamped 1952) |
| Mechanism | Mechanical, Wind-up |
| Case Material | Natural Wood |
| Special Features | UDG Club markings, original warranty stamp |
This offer is directed at serious collectors seeking rare examples with documented provenance. The clock is ready for immediate use or display.


