First off... welcome to Tnet from Toronto Skilegos!
For us to be able to better assist you in identifying your find, we need context.
What is it made of?
Where did you find it?
How was it found, with your eyeball or a detector?
Dimensions... please tell us the measurements or take a pic of a coin next to your item.
Hi there. The symbol on the lower piece looks very similar to that i have seen on British cannons. The numerals also look similar to some I saw engraved in a concrete slab dated 1937. That's just my opinion however, I'm not an expert. Good luck!