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938 is the assay stamp and relates to the purity of the metal, so that would be how many parts per thousand are actually silver - i.e Sterling Silver is stamped 925, being 925 parts per 1000 and Royal Silver is stamped 975, being 975 parts per thousand.
As with most metal jewelery and medals, the lower the purity of the metal, the more hard-wearing it is and the higher the melting point, which is why you can solder Sterling Silver with a blow torch, by painting the joins with flux and using tiny bits of pure silver placed over the join, which melt first and flow into the gap to join the two parts.
Al
Last edited by Chock; 2 September 2009 at 07:25 AM.
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