From the "Odds & Sods" liner notes by Brian Cady.
Produced by The Who at Eel Pie Studios (a/k/a Pete’s garage in Twickenham) late May 1970 with additional horns produced and played by John Entwistle and recorded at Ramport Studios, London 1974.
"’Postcard’ is a John Entwistle song about touring on the road. He describes in luscious detail the joys and delights of such romantic venues as Australia (pause to fight off temporary attack of nausea), America (pause to count the money) and, of course, that country of the mysterious and doubting customs official, Germany (pause, whether they like it or not, for ‘God Save The Queen’). Listen out for the field sound effects ACTUALLY RECORDED IN THE COUNTRIES WE TOURED. ‘Postcard’ was originally recorded in my house for a maxi single. They were EP’s that only cost as much as a single. Ours unfortunately never got released. I engineered this one with one hand on the controls and the other on the guitar. That’s why I only play one chord throughout the whole song."
This EP was listed in Gary Herman’s 1970 book The Who as being their next release. The track listing he gave was "Water"; "Don’t Know Myself"/"Naked Eye"; "Postcard". During the Summer 1970 North America tour Pete said, perhaps jokingly, that this EP’s title would be called 6 ft. Wide Garage, 7 ft. Wide Car, a reference to it being recorded in Pete’s garage. After the tour, Pete told Disc and Music Echo that the tracks would be "Water", "I Don’t Even Know Myself", "Postcard" and "Now I’m a Farmer".
"Postcard" was the single pulled from Odds & Sods in the U.S. (the first U.S. Who single with an Entwistle A-side ) backed with "Put The Money Down." It hit the Cash Box charts November 23, 1974 where it peaked at #64 (it did not make the Billboard charts). The single was also released in Canada, in France with B-side "I’m The Face" and in Brazil as the first track on an EP.
Track 20 on the 1998 Odds and Sods CD which features a different mix from the original.