My wife and I independently own the same 1965 Book Club edition of Dune. Today we found out that the hard covers are different colors. Is it common for the same edition of novel to have variants in the same year?
from /r/books
我和妻子独立拥有同一本1965年书友会版的《沙丘》。今天我们发现，硬封面的颜色不一样。同一版本的小说在同一年有变种的情况是否常见？