I owned C56B1991 back in the 1960's and would love to find it.
It was originally two tone gray per the serial number plate. 11-18-1B6K-1208-5
Where did you see it listed? What is CL?
Last know whereabouts was back in 20012 as mentioned here in San Fransisco by Jim Fox.
When I sold it in 1964 it went to San Fransisco so maybe it has been there ever since.
Jack Bowser
C56B2198
Past Ownership 1991, 3206, and 1763
2006 Ford GT
2006 Cadillac XLR-V
427 Cobra
2012 Mercedes SLS AMG Roadster
1924 Dodge Brothers Rat Rod
Lots of Bowser gas Pumps