I have one as pictured by Mike, with key, and it must be from a later model because the outer part of the key has molded plastic, 113s didn’t have that; I think I’m correct! I’ve owned two 113s, they each had the “ribbed” Chrome type w/Star, but never gave the Cap a second thought, good discussion! But just a thought, some of us seem to get so intent on “being original” that we sometimes let more attractive things pass us by, as in the gas cap, and how can anyone deny that the Chrome one doesn’t look better on the Pagoda! I can assure you that the Chrome Cap was available at the dealer, if not standard equipment. No rules broken there! Another example of of so called “original”/non-original discussion is the fender trim standard on the W112, 300SE Cpe/Cab, and a dealer installed option on the W111’s. . The 230SL in the Mercedes Benz Museum in Stuttgart has the same Fender Trim, gorgeous! LLLL