How do you know if your grandads navy medals are real?

To determine if your granddad's navy medals are real, examine them for authenticity markers such as hallmarks, maker's marks, and appropriate inscriptions. Check for wear and patina that suggest age, as well as the correct materials used in genuine medals, like certain metals or ribbons. You can also research the specific medals online or consult with a military historian or expert in militaria for verification. Additionally, comparing the medals to known authentic examples can help confirm their legitimacy.