At least you don’t have to carry heavy iron rings with you these days. Although, if you look at some people’s keychains, they must be at least as heavy as those of the Middle Ages. Personalized keychains look similar to dog tags. They were introduced in the military service in the 19th century to identify soldiers. It usually shows a personal identification number, a country code and the blood group. Dog tags are also worn by civilians and dogs these days, which is why they are also called “dog tags”.
Always with you – personal: key fobs and identification tags
