A '64 World Fair, a '65 Buckaroo, but no '66 pin. Hurdy Gurdy/Central Park, Subway/Cross Town...would all be candidates for me. And....I just invented some more room, Hmmm.
Edit: Dancing Lady is actually the mo/yr (11-66). My daughter would love that one, better not show her any pictures. She doesn't play, she just would see the ballerina in the back box and want me to buy it.
*just saw game play video of Dancing Lady. I really dig it!