Different choices by US Oyster execs saw this lush ballad released as a single in the US, backed with the lively "The Soldier's Tale" (the latter was briefly revived - to some surprise - in the Acoustic Strawbs live act, the former now back in the Electric band repertoire).
US promo release
A date stamped (on the company sleeve the promo came to me in) gives the release date of 16 Aug 1976. The blurb scan is from Alison Brown
Originally thought to be promo only, a release copy of this has turned up.