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| - SOLD Dutch Chess clock
- German clockworks
- Made in the 1950's
- 'Schaakclub Nieuwendam'
| | - SOLD 'Koopman' Chess clock
- Hugarian 'Danuvia' clockworks
- From the early 1950's
| | - SOLD Junghans 'Pocket' clock
- Made in Germany or England
- From the early 1930's
- Mahogany casing
| | - SOLD Rare Czechoslovakian Chess clock
- Bakelite
- Mid 20th century
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| |  | - SOLD Large Dutch Chess clock
- German clock movements
- Approx 1900 - 1920
- Retailer's label "G. Happé"
| | - SOLD Swiss Chess clock
- Excellent movements
- Approx 1950
- Maker: Birse Clock, Court
| | - SOLD Dutch Chess clock
- Art Deco faces
- Made March 10, 1936
- Maker: Koopman, Dordrecht
| | - SOLD Very rare chess clock
- Thomas Haller AG
- Late 19th century
- Formerly in use at the 'Koninklijke Antwerpse Schaak Kring' (KASK, Belgium)
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| - SOLD German chess clock
- Maker: Paul Posingis
- Approx 1935
- Mahogany case
| | - SOLD Solora chess clock
- Retailed by Koopman
- May 1949
- Swiss movements
| | - SOLD Solora chess clock
- Retailed by Koopman
- 1946
- Swiss movements
| | - SOLD English chess clock
- Walnut case
- Art Deco period 1940
- Maker unknown
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| - SOLD Dutch chess clock
- Oak case
- 1914
- Marked 'HK 1914'
| - SOLD English Enfield chess clock
- Metal case
- 1951
- Lovely and rare timer
| - Dutch chess clock
- Oak case
- 1960
- Made by Koopman
| - Dutch chess clock
- Oak case
- 1940
- Made by Koopman
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