#382 - 1911 15ยข Single Line USPS Watermark
See below for details
Basic Info
15¢ - Pale ultramarine
Printing Method: FLAT PLATE
Subject: George Washington
Number issued: 16,000,000
Perforations: P12
Watermark: Single Line USPS (see below)
Scott #: 382
Issued: March 1st, 1911
Value
Used
$5 - $10
No postmark with gum (MH)
$100 - $250
Full perfect gum, no postmark
no trace of stamp hinge mark (MNH)
$270 - $400
Notable Sales
A plate block of six which in mint never hinged condition is uncommon.
Top plate block sold at Siegel's December 2017 for $5,015 (MNH)
Explore Robert Siegel's Auction Galleries
Plate #'s
#382 was issued with the following plate #'s
Imprint and number
4949-52, 54
A New Watermark
The purpose of this change was to strengthen the paper and to give it a more uniform thickness. The old double line watermark covered too much space and made the lettered area quite a bit thinner than the rest of the paper, which caused variation in the shrinkage of the paper. The new watermark was also smaller, occurring 400 letters to a full sheet instead of 360.
Single Line USPS Watermark
Earliest documented use
The earliest known date of use is April 25th, 1911
Proofs
Die proof on India mounted on card
340-P1
340-P1
1910-11 Single Line USPS Watermark Issues
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