RAF or continental air force eagle?

[Stma]

Hi,

Please could someone advise if this is an RAF or foreign / continental air force eagle? The badge is made of brass and hollowed out as seen.

The reason that I am asking is that the eagle head is facing to the left as opposed to the right (which as far as I am aware, would make it RAF if facing to the right).

Also, could it perhaps be a Free Polish Air Force eagle (as the maker says Firmin and therefore be British made but for Polish Air Force)?

On the other hand, could it be a copy as the Firmin maker stamp is raised and not stamped into the metal....i.e. this could be the sign of a copy....

Finally, if this is genuine, would it have been worn on a cap?

Any feedback would be much appreciated.

Many thanks