Original illustrated mailing envelope has Macfadden Publications, Inc. return address and has inked name/address in provided area. Scattered wear w/horizontal/vertical folds. Fine. Envelope contains six-piece membership kit w/pieces measuring between 3x4-7/8" and 8.5x11". Kit includes membership card w/red pencil name. 3x4.5" single-sided "Monthly Brownie Service Award" card w/May 23, 1937 inkstamp. Unused "Prize Order Blank" has April 23, 1937 inkstamp. Lower right has three pinholes from included .5x5/8" "Liberty Lucky 13 Club" badge w/pinback. Welcome letter on "Macfadden Publications letterhead notes "Physical Culture, True Story, Liberty, True Romances, True Experiences, Love And Romance, True Detective Mysteries, Master Detective, Movie Mirror, Radio Mirror" and "Photoplay" publications. Horizontal fold at center as issued. Small sales folder notes "23 Club" for boys who regularly sold at least 23 magazines a month. Last item is "Supplement Of Liberty Prize Catalog - Number 10" which features pages of prize items including Mickey Mouse pocket watch and fob. Scattered aging/wear, most pieces are VF-Exc. overall. Obscure club kit and rare as complete.