I purchased this jacket off eBay years ago, always thought it was a M422a, but after reading the 'A Better Fighting Garment' article it appears it may be an AN-6552. When I bought it, it had a grey replacement mouton collar, home-made leather cuffs, 'modern' waistband, no tag, original red liner non-original zipper. The goatskin is very heavy, and in great shape. The only marking on the outside is the yellow 'US' centered under the collar. It looks similar to the American Sportswear AN-6552 yellow 'US' from the article, but seems a bit different. On the inside of the jacket, after removal of the lining I found "AP3 36" stamped in ink on a number of the leather sections. Anyway, anybody have or have had a similar jacket and can identify the manufacturer. Here are some pictures: