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 Stamps:
Email:
Mike Girard - Owner / Operator / Web Master:
g1rardmn1099@comcast.net
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I am a member of the American Philatelic Society
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I am a member of the United States Stamp Society  USSS #: 16733 Visit the United States Stamp Society Website at www.usstamps.org |
I am a member of the Perfins Club
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