Thiel has been produced between 1951-1954 years, when Thiel Company (originally found in 1862) was expropriated by USSR forces under the 'Awtowelo' stock corporation (consequences of the 2nd world war). Size/Weight: 17cm x 5cm x 9 cm / 500 gram. Clock movement: 'Caliber 6'. Photo: Georg Maicherczyk on the German Championship Tournament (1953).

UMF Ruhla (or officially 'Model 603') has been produced late 1950th to early 1960th. First generation of Model 603 had only clockface-related changes (in comparison to its predecessor Thiel). Second generation had already new movements (similar to its successor Garde). This model has been used on the Polish Women's Championships in 1960 (could be recognised from the game between D.Samolewicz against A.Litwinska)

Shortly before 1960, a new clock movement has been introduced (called Caliber 69/67), which was further used for the new line of clocks UMF Ruhla. Produced between 1961 and 1989.

The earliest generation is recognised by 'UMF Ruhla' logo on the clock face as well as striped sides of the wooden box. Photo: J.Donner vs. M.Udovcic on the 3rd IBM Tournament (Amsterdam, 1963).

Second generation of Ruhla Garde: no more wooden stripes, different logo, clockwork remains the same. The most important games with this Ruhla model are definitely rivalries between Karpov vs. Kasparov (Seville 1987).

Latest Ruhla generation: on the first sight just Logo has been changed, however real changes go much deeper: everything, what could be done from plastic (inlcuding design elements as well as some parts of the movements) is done from plastic. Photo: E.Friedrich vs. A.Siggelkow on the 30.Open Radebeul Championship (Germany, 2019).

Garde Electronic: a unique chess clock in its kind. The idea to combine an electronic chess clock with two analog time displays belongs to E.Weisheit, P.Paust and H.Bodach, who registered their patent (EP1882995A2 -> G04G9/0082) in 1997. Based on it, early 2000th Garde Ruhla GmbH took over the production. Despite the fact, that this clock includes a “Fisher Increment” (approved by FIDE) and meets all the requirements for a future-oriented chess clock, it wasn’t produced massively. Photo: German Blitz Team Championship (2003).