What it this?

[SpaceSlonik]

I'm currently on vacation in Spain, and I stumbled upon something interesting. After cleaning it up, I noticed that it looks quite old. Can anyone help me identify what this might be?

 

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[Blackfoot58]

I can’t really tell the size. Possibly part of a metal cap from a jar/container?

 

[SpaceSlonik]

I can’t really tell the size. Possibly part of a metal cap from a jar/container?

I dont have a ruler but my iPhone Ruler App says 6 cm/ 2,3 inches

 

[Gare]

I don't see any thread marks for like screw on cap. Maybe a type of dish or pan

 

[CRUSADER]

Looks like pot metal, so not much more than 100 years old.