My grandfather died and had this padlock in his possession. It doesn't appear to have any markings on it, and I know nothing about this topic. Does anybody have any idea what this might be or how to find out?
https://ibb.co/H23PrFD
https://ibb.co/19XVVBj
https://ibb.co/0y9YfKt
https://ibb.co/HdGH3tL