The Suzuki A series ran from the mid 60's to 1969, and came in 50cc & 90cc (and the sexy 'Stinger' T series 125cc). Grab 'em while they're cheap.................
The SS 50 & CL 50 blurred the lines between moped and motorbike, and in 1971 were the last of the "T" shape pressed steel frames (along with the Suzuki AS50 - A90 and the larger capacity Kawasaki G1 & G2's)