©1958-59. Later issue of club that started in 1939 and ran to 1965. Envelope has typical wear from mailing and is Fine. Welcoming letter is flat with lt. aging and two faint circular marks from button. Fine. "Superman's Secret Code" cardstock folder has light traces of wear but is Exc. "Supermen Of America" membership certificate #509829 has been folded once as mailed with circular area of oxidation soiling from button collet. Button included in this lot has lt. oxidation on reverse. Also has two sets of pin holes where button had been attached to paper. Fine. 1.25" dia. button is still bright, glossy and Fine. Certificate and Secret Code have name and address of recipient filled in neatly, one in pencil and one in pen. Overall a very nice original kit that is complete.