The description of dimensions rules out Phonoecian. Not that it was deeply considered.

Their cylinders are often a bit shorter and wider than Mdina.
I've just looked at the two Mtarfa cylinders I showed - one is taller than Mdina, the other is shorter.
And I have a more recent Mtarfa cylinder which is smaller and wider. Dimensions were more consistent at Mdina. It can sometimes help.

I've not seen the decor in your turned rim ashtray before, or a green base colour. I've learned!
I've got a turned rim ashtray too, but the base metal is clear and the decor is those greenish blobs, while yours is crizzled, and I don't know where the red that appears, appears from, and it's fascinating!