This is an 11 1/4” x 8 3/4”  339 page hardcover in excellent unread condition.  I couldn’t find any info about it online, so my speculation is that it is a private publication of the newsletter for the Members of the Baronial Order of the Magna Charta, The Military Order of the Crusades, and the Descendants of the Templar Knights.  They do have a website with stringent membership requirements.   There is no mention of a newsletter, except in the introduction of this book.  It is basically a history book concerning the Magna Charta through the Middle Ages up to a few current references, all taken from their newsletter.  The print is large and there are a few color photos.