Riverside Stamps

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Horizontally Perforated 12 10¢ Coil, Used Single.

The US government never produced a horizontally perforated 12 10¢ coil and there is no imperforate stock from which to add perforations to make such a coil. The only answer to this is that the suspect is either a Scott #338 (double line watermark) or a Scott #381 (single line watermark) single that has had the perforations trimmed away from the left and right sides.

The suspect was dipped in watermark fluid but a watermark did not present itself. The 10¢ issue is notoriously difficult to watermark because of the yellow color. The only way that I was able to see the watermark was to digitally apply a cyan filter, decrease the brightness and increase the contrast. The images below show the suspect in watermark fluid in natural light (left) and enhanced (right).

 
Natural Light

Enhanced
 

The watermark is a single line reversed “S” in the lower left corner.

Conclusion: In my opinion the suspect is a Scott #381 with the left and right perforations trimmed off.

Reference material used:

  • The Expert's Book. A practical guide to the authentication of United States stamps. By Paul W. Schmid.

As always comments and suggestions are always welcome.

To Contact Riverside

To Contact Riverside Stamps:
Email:
Mike Girard - Owner / Operator / Web Master: g1rardmn1099@comcast.net


I am a member of the American Philatelic Society

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USSS #: 16733
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