Rolex

Dear Forumers, my dad died last November and I inherited this watch... Does anybody know if it is a real Rolex or a fake? Thanks in advance, D. G. ...  

From it's appearance, probably from the 1920s. We really need to see clear pics of both the inside case back and movement (and a real clear close-up of the dial wouldn't hurt) to be sure on your behalf.

But hard to tell whether it’s real or fake just by this pic.