Polish WW2 Commando badge from coin

[Aniki]

Hi, can you please help me identify story of badges for no 10 Polish commando during ww2? They were supposed to be made from British coins. Many thanks in advance 

[Trooper_D]

Do you have the dimensions of this badge? As the surface of this example is uniformly flat, I find it hard to believe that this particular one was made from a coin. However, if we know its diameter, it will be possible to identify the coin it might be fashioned from.

 

From my memory, the only one that might have been big enough would have been a 'half crown', which was made of silver, at that time, but was only 32mm in diameter (according to Wikipedia) so I wonder if it would have been big enough for this purpose.