another question? about coffee mugs

[blugotti1]

been finding some old coffee mugs as well. found one yesterday, cleaned it up and it has an "S" on the bottom. does anyone know what this means or know a good site for old coffee mugs? thanks,David

 

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[Harry Pristis]

It's possible that the "S" stands for "Shenango".

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[blugotti1]

i guess it could. here's a pic.