Another great article, and very useful too but aren't we forgetting another member of the Speedy bezel family?
Here's my 1967 cal 321 Speedy with a Pulsations or Doctor's bezel. It is used to measure heart-rate by recording the time it takes for 15 heart-beats. The watch is stopped after the 15th beat and the equivalent BPM is displayed.
What do you reckon to this one?
Cheers - Simon
