Of the blue inside envelopes, only the 10 value was overprinted. The overprinted stamps were placed on sale August 28, 1893. Varieties caused by printer's errors exist in the form of double and even triple overprints and inverted or diagonal overprints. Click here for examples of the double overprints . None of the varieties is common and of the doubles, the 1 is particularly rare.
Triple overprints are also rare.
Send me an E-mail with information about examples of double or triple overprints. Send me an E-mail if you know of examples. Some of these essays are known canceled. The envelopes are listed as UPSS SDE 1 and as Scott UE1. Describes the artifacts housed at the National Philatelic Collection and details of the orders given by PMG Whitney.