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).