What kind of gear is this?

[SCDigginWithAK]

What type of gear is this? What I mean is did it go to a. Windup toy, clock, pocket watch? It's about the size of a half dollar.

 

[NOLA_Ken]

I'd say clockwork mechanism of some sort.

 

[bradyboy]

Bike sprocket ?
BradyBoy

 

[CRUSADER]

medium clock I think

 

[SCDigginWithAK]

Thanks guys. I didn't know because I've never found one with the stem like thing on the back.