There are several Seamaster chronographs i believe. Both Divers 300 and PO. I suppose the chronograph function may be operated even under water.
Maybe try searching in omega website or in the main forum. Am just not familiar with them as a dive chronograph never appealed to me.
Am not a diver. Just curious. Is there a practical use for a Chronograph under water? I understand the need for a legible dial and the bezel timer. I really have no idea for the chronograph.
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