Here are the exact Scott catalogue numbers:

5013 (25¢) Eagle coil – green behind “USA”, litho., serpentine die cut 10¼ vert.
5014 (25¢) Eagle coil – blue green behind “USA”, litho., serpentine die cut 10¼ vert.
5015 (25¢) Eagle coil – blue behind “USA”, litho., serpentine die cut 10¼ vert.
5016 (25¢) Eagle coil – red violet behind “USA”, litho., serpentine die cut 10¼ vert.
5017 (25¢) Eagle coil – brown orange behind “USA”, litho., serpentine die cut 10¼ vert.
5018 (25¢) Eagle coil – yellow orange behind “USA”, litho., serpentine die cut 10¼ vert.
a. Strip of 6, #5013-5018

On September 2, 2015, in Eagleville, MO, the U.S. Postal Service® will reissue the Spectrum Eagle Presort First-Class Mail® nondenominated stamp (priced at 25 cents), in six designs, in a pressure-sensitive adhesive (PSA) coil of 10,000 (Item 788500).

The stamps will go on sale nationwide September 2, 2015.

The Spectrum Eagle Presorted First-Class Mail issuance celebrates the grandeur of the bald eagle with an artist’s rendering of this magnificent bird. Originally issued in 2012, these stamps are being reprinted in 2015. The eagle’s profile is depicted in white, set against a sequence of six varying shades of reds, yellows, greens, and blues. Each color blends with the one following, resulting in a gradual spectrum from left to right across the six stamps. Illustrator Michael Osborne worked with art director Ethel Kessler to create the stamp art.

How to Order the First-Day-of-Issue Postmark:
Customers have 60 days to obtain the first-day-of-issue postmark by mail. Each cover must have sufficient postage to meet the First-Class Mail requirement. They may purchase new stamps at their local Post Office, at The Postal Store® website at http://www.usps.com/shop or by calling 800-782-6724. They should affix the stamps to envelopes of their choice, address the envelopes to themselves or others, and place them in a larger envelope addressed to:

Spectrum Eagle Stamps
Cancellation Services
8300 NE Underground Drive, Pillar 210
Kansas City, MO 64144-0001

After applying the first-day-of-issue postmark, the Postal Service will return the envelopes through the mail. There is no charge for the postmark up to a quantity of 50. For more than 50, customers have to pay five cents each. All orders must be postmarked by November 1, 2015.

There is one philatelic product for this stamp issue: 788517, First-Day Cover (set of 6), $5.64.

Technical Specifications:

 Issue: Spectrum Eagle Stamps
Item Number: 788500
Denomination & Type of Issue: Presorted First-Class Mail
Format: Coil of 10,000, 6 designs
Series: N/A
Issue Date & City: September 2, 2015, Eagleville, MO 64442
Art Director: Ethel Kessler, Bethesda, MD
Designer: Ethel Kessler, Bethesda, MD
Typographer: Ethel Kessler, Bethesda, MD
Artist: Michael Osborne, San Francisco, CA
Modeler: Joseph Sheeran
Manufacturing Process: Offset
Printer: Ashton Potter (USA) Ltd. (APU)
Printed at: Williamsville, NY
Press Type: Muller A76
Stamps per Coil: 10,000
Print Quantity: 150 million stamps
Paper Type: Nonphosphored Type III
Adhesive Type: Pressure-sensitive
Processed at: Ashton Potter (USA) Ltd. (APU)
Colors: Black, Cyan, Magenta, Yellow
Stamp Orientation: Vertical
Image Area (w x h): 0.73 x 0.84 in./18.54 x 21.34 mm
Stamp Size (w x h): 0.87 x 0.98 in./22.10 x 24.89 mm
Plate Size: 594 stamps per revolution
Plate Numbers: “P” followed by four (4) single digits
Coil Number Frequency: Plate numbers every 27th stamp below stamp image