This series of reprints was first published in 1895. Each year or two until the series was discontinued in 1910 the front cover changed. The book shown below was published in 1895-1896. This format had the acorn pattern on the left of the cover and various floral designs on the right. Interestingly this is the only book that I have seen in this format that has actual pictures within the floral pattern. As you can see there are portraits and a stairway in the repeating pattern on the right.

This right sided pattern is the 12th different one shown in the database. See http://henryaltemus.com/series/series141.htm.
It is not known how many others designs there are.