First generation of Swedish chess clocks: solid wooden case, classical shuttle slider and absence of flags. Its first advertisement appears in the Swedish Chess Magazine in 1925, presumably, these chess clocks were produced starting from early 1920th. Given model could be also recognized from the game between Gideon Stahlberg and Erik Lundin at the Swedish championships in Kalmar in 1938.

'Typ Schackvarlden' clock is associated with the Swedish player Karl Berndtsson (multiple champion of various tournaments), who started in 1923 his own chess magazine 'Schackvarlden' and advertised this model already in 1928. Karl passed away in 1943, 'Schackvarlden' magazine stopped at 1945, obviously the last clock has been produced around early 40th. As manufacture volumes were relatively low, clock did not appear often in the tournaments, nevertheless there are still evidences available, like in the game between Gosta Stoltz vs Gideon Stahlberg in the Swedish Championship (1931).

Quite a mysterious Swedish chess clock. Wooden pushbar case refers to 1920-30th. The movements with untypical second hands were taken from some alarm clocks, keeping an alarm function till now. Clock faces (marked 'foreign') originate from 1930th. It's not easy to identify / recognize properly the clock after numerous modifications and restorations, nevertheless, it remains a good example of Swedish history.

Swedish ‘Nyholm’ chess clock, named from the Swedish chess star Gustaf Nyholm. There is no reliable evidence when this model has been produced, however it already appears on photos in 1937 (Euwe vs. Stahlberg) and in 1939 (Lundin vs. Danielsson). Also Nyholm’s movements are equal to another Swedish model 'Typ Schackvarlden', known already from 1928. It might be reasonably concluded, that the clock is from mid-late 1930th. Nyholm has been widely used in pre-war Sweden, photo: occasional players on the chess tournament in Uppsala (1945).

Classical 'Swedish Federation' chess clock. Both clock movements as well as faces are totally identical to the Koopmans from mid 1940th to the late 1950th. Surprisingly there are not a lot of photo evidences of the usage of this type of clock on tournaments (at least, in comparison to other Swedish); also, all the available photos refer to the second part of 1950th and 60th. Photo: Boerje Jansson (1972).

Traditional swedish pushbar chess clock called "Tower Clock" with the Jungahs W.783 movements. The W.783 movement is titled internally 'J250' with plates 57 x 52,5 mm. There are version with 200 beats and a 'Bivox' type with 150 beats per minute. This movement might appeared in the later 1930th and was built until 1970th. Number '72' may refer to the year of production 1972. Reference: an advertisement in the Swedish Chess Magasine (1973).

Second generation of the Swedish 'Tower Clock'. This time the case is from plastic; instead of the Jungahs W.783 movements PA Caliber (joint production of German “Peter Uhren” and French 'Jaz') has been used. First evidence of this clock appears in a Swedish Chess Magazine 1976, clocks were produced until 1990xx (if not later). Widely used in Sweden in all types of chess clubs and events. This model has been also used in a 6-games match between M.Tal and U.Andersson (Malmo, 1983) to determine one of the reserve spots in the 1983-84 FIDE Candidates’ cycle (result 3:3).

Another variation of the Tower clock, with 2 main differences: new generation of the Peter Uhren movements as well as different flags: made out of wire (not out of plastic like in previous version). Photo: A.Karpov vs. G. Kasparov in the Chess WorldCup (Skelleftea, 1989).

Another traditional (late) Swedish chess clock. A '3-stars' Logo on the clockface defines "Peter Uhren" as a clockwork manufacturer, logo 'Jaz' on the clockworks (btw, it’s so-called PA Caliber) refers to the 1970th - eventual clock manufacture date (German 'Peter Uhren GmbH' merged with French 'Jaz SA' in 1967, however from 1975 onwards Jaz SA stagnation started). Such clocks were extensively used in Sweden, maybe also Pia Cramling (SkolSM, 1981) holds this clock? :)

Later version of classical swedish pushbar chess clock, this time with the Jerger movements. This is might be the original alarm clock, used as the basis for the "swedish jerger" model.