Hi, There is an H&H Port. on G/B for $7000, auction #555295048.
Received my copy of your book, congratulations on a wonderful job. One thing I would like to add, Armex didn't get all the Guatemalan rifles. My pre-sample, s/n 0032xx is stamped above the grip and trigger, right side,"LAW ENF ORD CO ATHENS GA 7.62" . Brought to the US and sold by Roger Cox, author of the Thompson book before his unfortunate difficulties with ATF.
Best wishes and good luck in your search