A Bit Of Trivia About Bronze

I was wondering what is the composite of the bronze that my pieces are cast in. My foundry says.

They use everdur bronze.

Alloy number 8 7 3

95% copper
4 silicone
1% manganese
developed during the second world war for the navy.

Prior to that something called 85-5-5 -5 was used, but it is not used now because it does not hold up with acid rain etc. It consisted of
85 copper
5 percent zinc
5 percent tin
5 percent lead