This cover from the USA carries 2 of the USPS National Parks forever stamps.
Country: United States of America
Date of Cover: 29th December 2016
- Left: Emperor Penguins (additional ounce). This stamp functions in the same way as the forever stamps; it will always be valid to cover the additional weight, whatever the rate.
- Middle: Marsh-Billings-Rockefeller National Historical Park in Vermont. The image on this stamp is a detail from a painting by Albert Bierstadt: Scenery in the Grand Tetons.
- Right: San Francisco Maritime National Historical Park. The image on the stamp is a photograph by Tim Campbell of the Balclutha.
These National Park forever stamps were issued as a set of 12 on 2nd June 2016.
Forever stamps from USPS are always valid for postage, whatever the increase in postal rates after you buy them.