Aw look at this! Kat mailed a box of DAW yellow spines to me. Two of them are both titled The Shattered Chain by Marion Zimmer Bradley, in her Darkover series.
Both were published in April 1976, and both have the same contents in the text including back page ads.
However, one is number UW1229, DAW collector #191 (that’s the bloody carnivorous alien chicken one) and the other is UE1840 (that’s the *ahem* “sword” cover).
A later Darkover novel, Thendara House, 1983, lists the UE1840 version in its end pages.
I’m calling “alternate cover” on this one.