First generation of the ex-Yugoslavian industrial chess clock INSA: a robust oak type heavy weight wooden casing with the integrated oscillating bar. As a Belgrade-based factory INSA (=INdustrija SAtova) was established in 1950 initially under the name 'Fabrika Satova' and re-branded to 'INSA' only in 1954, earlier chess clock models (1950-1954, presumably brown color) came without a traditional logo, however subsequent ones (1954 - early 1960th, black) already with a clear INSA on the face.

Photos: Dragutin Komsic vs. Stefanic (unknown date/tournament); Perencevic vs. Radoja, Semifinal of the Croatian Championship (Borovo, 1961-1962).

The second generation of the ex-Yugoslavian chess clock INSA: slightly smaller than its 1st generation wooden brother and completed fully from plastic (known in a variety of colors). Produced in 1970th / early 1980. Warranty for this specimen signed with a date 25 August 1983. Photo: two Croatian Maestros S.Peleh vs. Z.Majeric.

INSA analogue chess clock with 15 second increments for last minute in beech wood case. It is a relatively modern model, however it alredy left a mark on history, being designed shortly before 1990 for and used in the local 29th Chess Olympiad held in Novi Sad 1990! Furthermore it could be recognised in the 30th Olympiad in Manila 1992 (being most probably not the main clock). Advertised in German chess magasine Schach Echo (1999). Photo: Maia Chiburdanidze vs. Susan Polgar (NoviSad, 1990).