P.O. Box 187
     Wilmette, IL 60091-0187
     847-492-1284
    
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INFORMATION FOR COLLECTORS

Detecting reperforation jobs on scans are you tired of buying reperforated stamps on eBay? Here's how to detect most of them before you bid.

Evaluating feedback on eBay
97.6% positive feedback: is this a good rating or a bad one?

What you need to know about sniping auctions on eBay a guide to online sniping services and standalone programs.

U.S. classics: comparing the 24 1861 and 1875 proofs
how to detect inexpensive proofs altered to look like expensive stamps.

U.S. classics: natural straight edges vs. clipped perforations
one is normal on many 19th century U.S. stamps, the other is a profoundly serious defect. Here's how to tell one from the other.

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