u/Solid_Industry_9643

My grandfather gave this to me to get serviced however I'm sure it's fake. He gave me two others which I have had serviced at Rolex and I know are real. Those are a Daytona 16520 Black Dial and a submariner bluesy 16613. So I don't understand why he would own a counterfeit. Please give me a second opinion. He wore this everyday since he bought it in 1993 and swam in the sea basically every one of those days. However I'm still not convinced.