Error Or Counterfeit ?

Hi,
First, I want to say, errors are not my speciality...
with that said, this is what seem to be a very errorized british palestine 10mil,
double strike, hole, and even metal composition.

Refrence: in 1942 there were 2 materials used for 10 mils.
Copper Nickel & Bronze. the CoNi was discontinued in 1943.

This coin dated 1943, but it looks like CoNi. was never produced, but I assume theoretically a 1942 planchet could slip in the batch, or more realistically mint worker play around to set the striking machine.

I never seen the coin in hand, and the owner said is actually is bronze, it just look like nickel in the picture... "shrug"

anyhow, what bother me the most more then just a hunch am getting from the picture, is all the excess material in the hole.
(look like spilled cast metal, which make me think this is cast counterfeit)

I am still not sure what the exact process The Royal Mint used to make holed coins.
(i.e, holed plachent to begin with or holed in the strike process maybe even drilled and would appreciate if any of you can enlighten me about it...

actually any information appreciated for palestine holed coins, or any other holed coins stroke in The Royal Mint. palestine or otherwise...