Sgt. Pepper’s Lonely Hearts Club Band was originally scheduled for release in the U.K. on June 1, 1967. Instead, it was released early on the 26th of May. The U.S. release followed on June 2nd. However, when observing anniversaries of the album, people tend to use the June 1st date.
Sgt. Pepper was the first Beatles album to have the exact same tracking listings in both the UK and US versions.

Metropolitan Museum of Art, NYC

Beatles’ ‘Sgt. Pepper’s’ Cover Art: A Guide to Who’s Who

Jann Haworth: The forgotten creator of the Sgt. Pepper cover

Cover shoot for Sgt Pepper~
https://www.beatlesbible.com/1967/03/30/cover-shoot-for-sgt-pepper/