SSNOW,
Funny. I had a zinc display just like your picture on my work bench during my last sorting session.
Even though zinc is not written on the weight, they are easy to distinguish after a while.
By the way, the 5 gallons that I was sorting had 80% COWW, 15% SOWW, 3%Cast Iron, and 2% zinc.
Just like the good old days. I was surprised.
762