The Munsell book of color. Matte collection. (OCLC #871204356)
The copy I have in hand has no dates on it, and vendor web sites don’t mention when it was last revised. No records in OCLC quite matched it, and the differences were major enough to justify a new record in OCLC: slight change in subtitle, different tools included in a pocket, etc.
It is not surprising that there are so many new and different editions. The back of the binder has a blank to record the date you first use the book, so you can keep track of when it expires (two years later), ceasing to be a faithful representation of those colors, so the publisher may not keep a large stock of the current edition.