St. Christopher Pendant

My dad wore this when he was 14 to 16 years old. I asked him why he had this pendant considering that he isn't Catholic but he said that surfers and teenagers during this time would wear this type of charms as a cool thing. We guess that this pendant was made in 1964 since that was when he wore it but there is no date on it. On the back it says sterling sliver and that's it.