The stars are printed on industrial SLA printer.
4 corners star fits 5606, 5626 and 5646
8 corners star fits the whole 56 range, 5606, 5619, 5625, 5626 and 5646
Both types are now in an updated version
I've done several tests with 8 corners on 5606, 5626 and 5646 and it works actually better. The date ring turn "smoother" so from now only 8 corners will be available.