Reference 551.413 is a split-second stopwatch, with “Taylor” timing; 60 minute capacity; marked in decimal minutes. Instructions are here. The Reference 551.413 stopwatch is shown in Heuer’s 1976 and 1978 catalogs.
Reference 551.413 is a split-second stopwatch, with “Taylor” timing; 60 minute capacity; marked in decimal minutes. Instructions are here. The Reference 551.413 stopwatch is shown in Heuer’s 1976 and 1978 catalogs.