The Time for Action catalog shows only watches and chronographs, rather than stopwatches and other styles of timers. Accordingly, there are only two types of regatta chronographs, the Reference 134.500 and 505 models (in the smaller cases) and the Reference 134.601, 602 and 603, which use PVD cases, borrowed from the Autavias. All these chronographs use colored discs to countdown the 5-minutes sequences. [See more of the 1984 Time for Action catalog HERE.] [links]