Found about 8# of this stuff, it's the ends of some "lead" bars which are marked "111" and the Dutch Boy logo. One of the partial bars has "NATI" and another one "LEAD" so I'm pretty sure it's a lead alloy. It seems really hard. Does anyone know the composition?
Side note: I also found some other small bars marked "40/60". Is that 40% Tin and 60% Lead? Hate to throw alloy away, but I also don't need any Zinc in the mix.