Unfortunately, Pewter is a common name describing several very similar metal alloys. It is important to know if it is lead-pewter (the kind the Romans used to use for drinking--causing madness; this is till used for small statues, trinkets, etc.) or silver-pewter or tin-pewter (the kind now often used in drinkware and jewellery). I would suspect it is silver-pewter and will be safe, but it is not necessarily wise to do so without checking.
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Modern Pewter is mainly tin. It is safe to drink from pewter.
It depends on when it was made and what metals were used. Fine metal pewter consists of tin and copper and is safe. The other two grades both contain lead and are not safe.