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
我和妻子獨立擁有同一本1965年書友會版的《沙丘》。今天我們發現，硬封面的顏色不一樣。同一版本的小說在同一年有變種的情況是否常見？