According to
W+S Water Safety Europe GmbH - Adapter für Sauerstoff Ventile nach Ländern Indonesia uses a 'British Bullnose'.
Same thread as a DIN, but rounded tip. There is also a 'Euro Bullnose' that looks alike but on that one the tip is under a fixed angle (NFE 29-656).
You can buy these adaptors from
Undersea. Their stuff is really great (although a bit expensive).
HTH
Steven