I'm not a great photographer, but this one turned out OK- and it reminds me about what a great watch the 3711 Dopplechronograph is to this day.
This model was quickly replaced by the 3712, and it lost a couple of desirable things in that change; the domed crystal, and the tritium dial.
Based on the workhorse Valjoux 7750 movement, Richard Habring made this difficult complication design for IWC, back when 'tool watch' was all they did. There are some interesting articles to be found on how Habring solved some difficulties using hypodermic needles to make space for two, instead of one, central axles thru the movement.
Nelson