I have done allot of research on these badges also and aggree for one thing the the T is diagnostic and is the only trade make used by this maker who was very a prolific maker of the U-boat badge. You will find several for sale on this sight e-medals who are trusted vendors look under German empire
http://www.emedals.ca/catalog_index.asp

PS DOND I went through the same thing with DAVEY and his junk he was popular because of his pictures etc but he still sold fake junk and got outed , he is where he belongs on another forum and folks here are a bit safer , it's how you do it but sometimes you are never right thats when you gotta let it slip off the deep end and just look at who is the critic and shake your head sleep on it .