Transcontinental Railroad 150th Anniversary, COLOR PROOF PLATE NUMBER Set of 6

Description

Hello!
This auction is for a complete set of color proof
BOTTOM ROW PLATE NUMBER
horizontal strips of 3 from the 150th Anniversary of the Transcontinental Railroad commemorative issued by the USPS on 5/10/2019 (Scott #5378-5380). These proofs were printed on untagged, self-adhesive stamp paper. The proofs are: offset black, cyan, yellow magenta, a composite proof of all of these colors and gold foil, which was applied in the final step of the printing process. A finished and tagged die-cut bottom row plate number strip of 3 is also enclosed.
All of the stamps have been cleanly cut from their respective sheets. The scan above represents the stamps that you will receive.
(See my other listings for middle-of-the-sheet strips of 3 and top row header included strips of 3).
In order to ensure that these stamps are not damaged during shipping, they will be shipped between stiff pieces of cardboard as a first-class package with tracking.
The USPS describes the production process:
"Both the primary design and the gold foil were printed with a single machine, reducing the potential for error and marking another major milestone in the world of stamp production. The included proofs provide a vivid record of every step in that process. The first shows the cyan elements of the design, while the second, third and fourth show those in magenta, yellow and black. The fifth proof shows all four of these colors printed together, and the sixth proof shows the gold foil that was applied in the final step."
Thanks for looking!
Check out my 400th anniversary Mayflower proofs SOLD OUT at USPS.
I am a 20 year APS member.