This is the largest SDS collection we've seen and we divided into this and the following two lots. In this group of 25, every item includes "SDS" except row 2, #3 and row 4, #4. All are from 1960s except row 2, #4 is from 2006 re-organization of the group. While the group formed in 1960 and their "Port Huron Statement" manifesto dates from 1962, as far as we know, their first button is row 1, #1 reading "A Free University In A Free Society/SDS." This was inspired by the Fall 1964 Free Speech Movement lead by student activist Mario Savio at UCLA/Berkeley. Vast majority are Exc. to Mint. Exceptions are row 1, #1 tiny faint edge dot, row 2, #2 moderate faint tanning, row 2, #3 few small scratches in reflected light. Row 3, #4 couple dark but small marks. Many rarities. See following SDS two lots related to racism/sexism/Vietnam.