It’s being a while that fakes and rip-off acronym showing up.  This topic will help(well,whatever you understand that lol)to recognize them or so. Now we already have following models F for jackets   J1A-GT （https://page.auctions.yahoo.co.jp/jp/auction/s537090179） for example,fakes export to japan and on sale here now and then. copy process lol   J1b-s(seems like new models these days) J44 J32 SS-J16 J56 J1ts(on the way)