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UK had a full release, but, as far as I know, the US had only a promo, with flipped A/B sides and a shorter title ("Day Without Love"). Not certain if (a) there was a UK promo - probably not; or (b) whether the US made it past promo status.
I had originally thought this was a promo release, because of the black A on the right of the label of side 1 (which previously only appeared on earlier silver label 45 promo releases, along with release dates, "not for sale" notices etc). But that is not the case - sometime in mid 1975, A&M started adding the black A onto all side 1 labels. (Thanks to Chris Smith of CMS Music for his steer on this.)
It looks as though they produced far fewer specially printeed promo labels, probably just slapping a sticker on a release copy. When they did produce a specially labelled promo, they put ANOTHER big A across the centre hole! See: the A&M "Part Of The Union" reissue page.
US promo release
Unusually, this US promo isn't a stereo/mono, but a shortened edit of the tracks from the album, with B side flipped to be the A-side, as "Day Without Love".
US release (*)
Not certain whether this ever made it out as a full release. Anyone have one?