If you look at my car on the CRG 68 page, an early picture of the car shows one just like it. I can't tell if it has a lock on it, but remember that some of these early pictures could have been near the oil crisis of '73. Gas was hard to come by and "entrepreneurs" found that stealing gas from other cars was easier so a lot of people had to get locking gas caps or when people were siphoning they tossed the cap and many were lost.
