First recorded by Four Voices (US #109 1960).
Other hit versions by Brian Hyland (US #3/UK #3 1962 |UK #7 1975), Gary Lewis & The Playboys (US #11 1968), Bobby Vinton (US #19 1972), Jason Donovan (UK #1/IRE #1/AUS #8/ 1989).
From the wiki: “‘Sealed with a Kiss’ is a song written by Peter Udell and Gary Geld. It was first recorded by The Four Voices in 1960 as a single. It peaked ‘Bubbling Under’ the Billboard Hot 100, at #109.
“In 1962, Brian Hyland, who often performed Udell and Geld’s material, covered the song. Hyland’s single began its run on 6th June 1962 and became a hit, reaching #3 on both the Billboard Hot 100 and the UK Singles Chart. When re-released in 1975, Hyland’s recording charted in the UK at #7.