Rolex Cellini

[JMN]

Hello everyone. My first time posting here. This watch was found with a bunch of antiques, and since I know nothing about watches, I need your help. I'm not sure if this watch is authentic, or if it's a fake. I'm also not 100% sure about what model it is, all I know is it says Cellini. Would also be great if someone could tell me what it's worth. As of right now it does not run, but it's in good condition so it might just be a quick fix? The glass is dirty on the backside, but i'm pretty sure it's just dirt or something and could be cleaned.

All help is appreciated!