I made a fortuitous discovery inside an old cup in the china cabinet. My father’s World War Two identity tag.  I had not seen this in many a year and thought it had been lost in a move. I was incredibly relieved to have found it.

It has his nationality (N.Z), service number (633301), religion (C.E = Church of England), Blood group (O) and of course his Surname and initials (SMALLER, B.C.D).

I am not sure what the material it is made of is. It almost feels like a hard leather rather than metal. Any help here would be appreciated.

https://woolshedwargamer.com/2014/05/17/lcpl-brian-smaller-633301-22-infantry-batn-2nzef/