First image looks like letters/numbers from Israel. What size?
EDIT: As there is nothing on the other side it looks like it may have had
something stuck on there, and as the first side has deep carvings then
at one time it may have been a stamp - so whatever is on there will be
in reverse, until pressed into say sealing way then it will be correctly viewed.
I have items of the same size and metal - see below -
and just now seen a reply below also thinks it was a stamp.
Those two small items of mine are in French and in reverse.
They read TOUJOURS D'ACCORD and VOUS LA MÉRITEZ the right way round.