Island 88 292 XCT.
This is a German 2-LP compilation of Island-era Mott, which came out in 1974. Sleeve-notes are in English and German and seem quite good; however, the discography omits Mott the Hoople but includes Rock and Roll Queen.
This 2-LP compilation was widely available in the mid-70s, but has long since been deleted. Note that it has never been issued on CD, nor is it ever likely to. All the tracks on it are available on CD elsewhere.