Even on the label it is both 937D and 858D
937D seems to be the proper model though i would say: I can only find 937D as soldering station and 858D as hot air station.
Voilamart GmbH is also quite interesting. Voilamart seems to be an australian company, but GmbH is german, the german version of a limited liability company.
Google knows a Voilamart GmbH that is closed.