I.W.C. Aquatimer Automatic Chronograph 44mm IW376705 7.75mm screw down crown
Tap 10 (0.90 mm). The crown is approx., 7.75 mm in Dia., 4.17 mm long on the top, 4.59 mm including the hub on the back and 7.76 mm overall. I should be able to resolve most problems. being imported.