Sorry TT - so much advice but nothing to tell you what you actually want to know!
Without knowing how the machine was adapted for 220V operation (e.g. did they fit a different motor), I don't think its possible to give a theoretical answer. The simplest option would be to ask the manufacturer - but the answer may depend on whether you spoke to a salesperson or a technical person!
One thing you can do is measure the current draw with an (AC) ammeter and apply Jonathan's calculation (which as Plague points out will give you VA!). This, however, will not tell you how the machine performed on 380V!
Having taken delivery of the machine (and presumably paid for it), you obviously want to know whether to send it back and buy the prettier, more expensive one! - sorry can't help you there.
Mike