Hiya Paul. I've had a couple of the CU 640 chips. Chauffeur's Union local 640 from Los Angeles. Back in those days and when I started, truckers need a chauffeur's license to operate. So it was a forerunner of a Teamster's Union local. My favorite thing is that it is an example of a plain mold T.R. King chip. Pulled out Chip Chat #35 as Doug had a writeup on one of these. No date listed but I infer the late '30's earliest. Value $12 all day long with something real good @ $20.