The Scott catalogue number is 5316.

Announced by the USPS on May 10th. It will be issued September 13th in Missoula, MT. Canada Post will be issuing five stamps for First Responders, September 10-14. The Firefighters stamp comes out on the same day as this U.S. issue.

Updated August 2nd, from the Postal Bulletin:
On September 13, 2018, in Missoula, MT, the U.S. Postal Service® will issue the Honoring First Responders stamp (Forever® priced at the First-Class Mail® rate) in one design, in a pressure-sensitive adhesive pane of 20 stamps (Item 478100). The stamp will go on sale nationwide September 13, 2018.

With this stamp, the U.S. Postal Service recognizes the men and women — firefighters, law enforcement officers, and emergency medical service professionals — who respond to critical situations with skill, dedication, and uncommon bravery. First responders are found throughout society, from small townships to the federal government, and their ranks often include a wide range of law enforcement professionals and public safety personnel. The digital illustration on this stamp is a symbolic scene that shows three first responders in profile as they race into action. Artist Brian Stauffer worked with art director Antonio Alcalá and designer Ricky Altizer to create this stamp.

How to Order the First-Day-of-Issue Postmark:
Customers have 120 days to obtain the first-day-of-issue postmark by mail. They may purchase new stamps at their local Post Office or at The Postal Store® website at usps.com/shop. They must affix the stamps to envelopes of their choice, address the envelopes (to themselves or others), and place them in a larger envelope addressed to:

FDOI – Honoring First Responders Stamp
USPS Stamp Fulfillment Services
8300 NE Underground Drive, Suite 300
Kansas City, MO 64144-9900

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. There is a 5-cent charge for each additional postmark over 50. All orders must be postmarked by January 13, 2019.

Technical Specifications:

Issue: Honoring First Responders Stamp
Item Number: 478100
Denomination &
Type of Issue: First-Class Mail Forever
Format: Pane of 20 (1 design)
Series: N/A
Issue Date & City: September 13, 2018, Missoula, MT 59801
Art Director: Antonio Alcalá, Alexandria, VA
Designer: Antonio Alcalá, Alexandria, VA
Designer: Ricky Altizer
Typographer: Antonio Alcalá, Alexandria, VA
Artist: Brian Stauffer, Novato, CA
Modeler: Joseph Sheeran
Manufacturing Process: Offset, Microprint
Printer: Ashton Potter (USA) Ltd. (APU)
Printed at: Williamsville, NY
Press Type: Muller A76
Stamps per Pane: 20
Print Quantity: 60,000,000 stamps
Paper Type: Nonphosphored Type III, Block Tagged
Adhesive Type: Pressure-sensitive
Processed at: Ashton Potter (USA) Ltd. (APU)
Colors: Black, Cyan, Magenta, Yellow
Stamp Orientation: Horizontal
Image Area (w x h): 1.42 x .84 in/ 36.068 x 21.336 mm
Overall Size (w x h): 1.56 x .98 in/ 39.624 x 24.892 mm
Full Pane Size (w x h): 7.24 x 5.92 in/ 183.896 x 150.368 mm
Press Sheet Size (w x h): 21.72 x 11.84 in/ 551.688 x 300.736 mm
Plate Size: 240 stamps per revolution
Plate Numbers: “P” followed by four (4) digits
Marginal Markings:
Front: Plate number in four corners of pane
Back: ©2018 USPS • USPS Logo • 2 barcodes (478100) • Plate position diagram
• Promotional text

From the USPS, July 19th:
New Forever Stamp Salutes First Responders
Dedication Ceremony at Montana Aerial Fire Depot and Smokejumper Center

WHO: The firefighters, emergency medical professionals and law enforcement officers who serve our communities across the nation.

WHAT: Honored on a Forever stamp at U.S. Postal Service first-day-of-issue ceremony

WHEN: Thursday, Sept. 13, 2018 11 a.m. (MDT)

WHERE: Aerial Fire Depot and Smokejumper Center
5765 W. Broadway St.
Missoula, MT 59808

WHY: Emergencies of various types occur in our communities every day, from crimes and medical incidents to accidents and fires. These critical situations require men and women who possess the training and knowledge to rescue the endangered, treat the injured, and restore safety and order. With this stamp, the Postal Service recognizes all first responders for their skill, dedication and uncommon bravery.

The dedicating official will be Guy Cottrell, Chief Postal Inspector, U.S. Postal Inspection Service.

Artist Brian Stauffer worked with art director and designer Antonio Alcalá and designer Ricky Altizer to create this stamp. Additional details will be provided before the ceremony date.

Original announcement May 10th:

With this stamp, the Postal Service recognizes the men and women — including firefighters, law enforcement officers, and emergency medical service professionals — who respond to critical situations with skill, dedication and uncommon bravery. The digital illustration on this stamp is a symbolic scene that shows three first responders in profile, facing right, as they race into action. From left to right, the first figure is a firefighter carrying an axe. The second figure is an EMS worker, with the EMS Star of Life visible on her cap, upper arm and emergency bag. The third figure is a law-enforcement officer shining a flashlight toward unknown danger ahead. The dark background and signs of smoke in around the figures suggest the wide range of situations that demand the immediate attention of a first responder.

Artist Brian Stauffer worked with art director and designer Antonio Alcalá and designer Ricky Altizer to create this stamp.

Updated August 18th:
Here’s is the Digital Color Postmark for this issue:It measures 2.43″ x 1.43″. Here is the B&W pictorial postmark:It measures 2.79″ x 1.55″.