Unique A Connecticut Yankee In King Arthur’s Court

By thread80

I picked up this older copy of Mark Twain’s Connecticut Yankee in King Arthur’s Court at the used shop where I work, and I’m not seeing anything like it online. It looks like it might be from 1889, with G.M. Rose and Sons listed, and the cover is just plain green with the title and Twain’s name, nothing else. Does that make it unusual?