and not the chip that Claridges opened with in 1981? (assuming they used a $1 when they opened)
Reason I ask is that I just took a good look at a couple of CLA-1 (green lettering) chips and they were definitely made later in the 1980's. True they may have been a re-order, but, have you ever seen a CLA-1 with spun (concentric circle) inlay like the one you say is a back-up?
In 1981, ALL Bud Jones coin centers were spun. The process whereby they were punched out from sheets etc. was not even conceived at that time.

Alternatively, it could be a chip that was delivered but never put into play. Either way, that brown lettered chip was made way before the green one.