^*Density of lead (Pb):
11340 kg/m^3
Calculator:
http://www.allmeasures.com/Formulae/static/formulae/density/20.htm
You can enter the weight in any format and it'll give you the expected
volume in many formats and vice versa

According to http://www.megalink.net/~sjcphp/Pewter.html
Pewter - tin, antimony, bismuth, copper, lead
In order for pewter to meet the standards of American Pewter,  it needs
to contain at least 92% tin.

Density of Tin (Sn)
7310 kg/m^3
Calculator:
http://www.allmeasures.com/Formulae/static/materials/36/density.htm

The upshot is that you can weight the piece, find it volume, and if is
weighs less than the expected weight for lead you can probably assume
it's pewter.  Many pewter alloys contain lead, however, so it's always
safer to assume you've got to deal with it and use a dust mask and/or
fan and filter system to protect yourself.

-Adam**

* ^ *
*Bob Ammerman wrote:

>Weigh it, then immerse it in a graduated cylinder to determine its volume.
>Compute density. You're done.
>
>With thanks to Archimedes.
>
>Bob Ammerman
>RAm Systems
>
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