#378 - 1911 5ยข Single Line USPS Watermark - P12
See below for details
Basic Info
5¢ - Light blue, bright blue, blue, dark blue
Printing Method: FLAT PLATE
Subject: George Washington
Number issued: 380,000,000
Perforations: P12
Watermark: Single Line USPS (see below)
Scott #: 378
Issued: January 25, 1911
Value
Used
25¢ - $1
No postmark with gum (MH)
$8 - $30
Full perfect gum, no postmark
no trace of stamp hinge mark (MNH)
$45 - $70
Notable Sales
A wonderful plate block with a wide margined stamp at top right
Sold December 2010 for $2,160 (MNH)
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Plate #'s
#378 was issued with the following plate #'s
Imprint and number
4958-59, 61, 73
Imprint, star and plate number
5341-76, 79, 96
5638-41, 49, 53
'A' and number
5994-98
5902-06
Number only
6348-49, 52-53
6733-34, 36, 39
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 February 14th, 1911
Proofs
Die proof on India mounted on card
335-P1
335-P1
1910-11 Single Line USPS Watermark Issues
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