The only thing I could find that has the Chevy bowtie emblem & the "C" on it is from a old dealer AD truck mailer that had one pictured on a truck. Since I am unable to locate any RPO or accessory numbers for it.... I say that it was aftermarket.
The closest I could find to a documented GM accessory is GM part # 986957 which is pictured on the " All Star Accessories " display for 1954 & it is also covered in the 1954 accessory installation manual.
