These items are shown here for reference purposes. They may be deliberate attempts to fake higher-value stamps, or they may be items that turned out to not be what they were thought to be when expertized.
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Faked provisional overprint.
Purchased as a fake, the decision by The Philatelic Foundation (1986 cert) is an interesting one. I have no doubt that it is not an R3a; the side margins are too tight. However, I question their determination that it is an R3d (silk paper). I scoured both sides of the stamp with 30x magnification and could find no evidence of blue silk threads. Making such a determination based on ink or paper color is not conclusive.
R3b trimmed at top and bottom to appear to be an R3a. Handstamp with inverted year slug.
Has characteristics similar to the Hart L. Pierce counterfeits.
Hart L. Pierce counterfeit with full original gum.
Likely a trimmed fake. The cuts at left and right don't look right.
Looks like someone trimmed it in an attempt to create an R8b, which does not exist. Still has a nice cancel though.
Importer. R18c Trimmed to appear as an R18b.
Wrong color for an early printing, in my opinion. Likely a misperfed R18c that has been trimmed.
Someone attempted to fake an R30a (which does not exist, according to Scott) by trimming perfs off an oversized R30c.
The top and bottom margins are too small and a bit too uneven to consider this a legitimate R33b.
Cancel type N-11AX. The jaggedness of the cuts would indicate that this is a trimmed-down R36b intended to fool people as an R36a. There appear to be residual perforations at bottom.
Great cancel, but top and bottom margins are too small to be sure that it is a legitimate part perf.
Silk fibers, but according to APEX 'not the silk fiber indicative of silk paper on the First issue' so apparently this is not a legit silk paper. Displayed here for informational purposes.
Fake bisect and overprint created by a dealer in the 1930s. Note that the stamp was overprinted twice, once before being affixed, perpendicular to the overprint on the document.
According to Scott, this doesn't exist. Most likely an R83c margin copy that someone trimmed top and/or bottom perfs from.
2009 APEX certificate. Purchased as a reference fake, a very crude attempt at faking roulettes. The only saving grace is the blue script handstamp cancel.
2009 APEX certificate. Purchased as a reference fake, this has got to be the most crude attempt at forging roulettes I have ever seen. The edges are crooked!