Chronograph With Center Minute Recording Hand Chronograph Functions index
Timing to 1/5 second.
Timing up to 60 minutes. (C')
Timing telephone conversations.
Center minute-recording hand. (D')
In this model the minute-recorder calibrations are shown round the edge of the dial and the minute-recording hand works from the center D', which facilitates reading.
C' = Timing up to 60minutes
D' = Minute recording hand