All,
Thanks for your advice, I added an image of the back to my post above.
I am sharing images of two more stamps in question, both with Protectorate overprints.
One is a 4p with an incomplete "P" in Protectorate, but the "4" also seems incomplete. Thoughts?
The other is a Protectorate 2d, that I don't believe has a curved tail, but perhaps you can confirm.

