Five items including mailing envelope, welcoming letter, certificate, secret code folder, and button. Mailing envelope has a few lt. handling creases with 1" tear at left flap seam edge. VG. Certificate has horizontal fold as mailed with a few lt. handling creases and barely noticeable tiny bit of paper gone from lower left corner tip. Fine. Letter, code folder and button are Exc. This club kit was issued from 1939 to 1965. Over the years a number of changes were made from simply updating the copyright to notable text changes in the letter and on the folder. This is one of the final years of the club. Certificate is copyright 1960 by National Comic Publications Inc. #515527 with member's name and address typed in proper place near top. Letter has PS noting "Superman Also Appears In World's Finest Comics And Jimmy Olsen Comics. And His Adventures As A Boy Appear In Superboy And Adventure Comics." Code folder has Lexington Avenue address including "New York 22, N.Y." Interesting graphics include early and later images of Superman using his chest to break chains.