One of the most mass-produced Roa model, dated from some mid 1970th. This clock is known with a variety of clock face designs (Roa logo on the upper or lower part; with a 'crono ajedrez' print or without it, etc). Movement with the information '121 Pi Argentina' has been either prototyped or licensed from the similar Junghans movement (see next clock). Officially used on the 23rd Chess Olympiad in Buenos Aires (1978). Photo: Karpov vs. Kavalek (Buenos Aires, 1980).

Slightly later Roa clock, coming /most probably/ from 1980th. Back part is completed from metal, the rest of the case is a solid pressed wood. Movements are native Junghans. Photo: M.Tal (year is unknow).