FT 3685

Rule 24F-2 notice filed on Form 24F-2

Rule 24F-2 notice filed on Form 24F-2

Certification of no change in definitive materials under paragraph (j) of Securities Act Rule 497

Pre-effective pricing amendment filed pursuant to Securities Act Rule 487

MACK JEFFREY C: Initial statement of beneficial ownership of securities

Anderson Brian S: Initial statement of beneficial ownership of securities

Initial registration statement filed on Form S-6 for unit investment trusts