Sturmey Archer S3C
The S3C was a common 3-speed coaster in the '70s. Schwinn Krate bikes often have these hubs. They are oil-filled rather than greased like the AWC. After the TCW was announced to be a safety hazard Sturmey redesigned their 3-speed coaster and came out with the S3C.
s3c.pdf — PDF document, 251Kb