Question regarding my zenith authenticity

Hi,

Bought a vintage zenith respirator - pretty worn down, I bought it here in Firenze from what seemed like a decent dealer, I didn’t open the watch yet and wanted to know if they make fakes of this model, and if this watch looks fake to you, spent quite a few bucks on it.

I’m new to the watch game so that could be a learning experience for me.

Thanks in advance