Some toys I remember having (circa 1969-1972):
Hot Wheels Sizzlers "Revvin' Heaven": a rechargeable car that ran on a slot-less plastic track.
"Strange Change Time Machine" by Mattel: Plastic figures were heated up until softened and then crushed into a square, flat block. You could reverse the process and put the block back into the heater and watch it transform back into the original figure.
Schwinn Sting-Ray: My first bicycle.