Identifying First Edition Children of Hurin

Hi there!
Forgive me if this is posted to the wrong forum or is incorrect in anyway. This is my first post and the first time on the site. I had a question about how to tell whether or not a "Children of Hurin" copy was actually first edition. Obviously this is not an expensive first edition, but it is going into a collection of firsts so I wanted to verify. I purchased it from a vendor who claimed it was first edition, first printing. It seems as if it is but I wanted to be sure. Many of the others have the editors number line on the copyright page, which helps in identifying a first edition but this one does not. I've attached a picture. Any help would be greatly appreciated. Thanks!
Best,
Ryan