Rolling Stones 7" records* were issued worldwide [including 855 UK and 732   US pressings].

* 1823 releases + 3380 variations, as of 28 April 2025.
You can't judge a 7" by looking at its cover!

Stones7.com is dedicated to the band's 7" singles and EPs worldwide from 1963 to nowadays. Daily updated, it's the most serious and complete reference in its field since 2000 [also the best price guide].
Visitors can browse free parts of this site, like a different's country discography every week or the single of the day.
For a little annual fee, members have full access to ... [+] all countries discographies, song by song browsing, price guide, in-depth datas, personal collection and want lists features.
Note: no fancy book or publication can reasonably approach this site's content and accuracy [more than 16,000 pictures currently documenting 5203 records]. More about it here.

'Sad Day' was released as a 7" single in the UK on April 27, 1973.
Originally recorded on December 3, 1965, and released first in the US as a B-side of '19th Nervous Breakdown' on February 11, 1966, 'Sad Day' was issued in 1973 as a single in the UK - and most of the world but the US - and was an attempt for Decca to promote the band's back catalogue through the compilation album 'No Stone Unturned' [supposedly B-sides and rare tracks].
Coupled with 'You Can't Always Get What You Want' - which previously was the B-side of the 1969' single 'Honky Tonk Women' - the single did not chart.