1983 Certified Bronze Penny

Uh...nice find :-)

Bronze is an alloy of copper, tin and zinc. For US cents it was 95% Cu, 2.5% Zn and 2.5% Sn.
Brass is Copper and zinc in the US cent 95% Cu and 5% Zn.
Most in the hobby incorrectly refer to brass as bronze and thus you have what might be a brass coin being called bronze.
The latest 1983 Copper Alloy cent was found and reported last week to be an alloy of 93.35% copper and the balance zinc, iron, nickel and a very sight trace of silver. So with your coin being underweight by a significant amount I guess I'd want to know what the exact composition is before I'd buy it. It's troubling that it does not say Transitional or Pre-1983 1c planchet on the slab anywhere. A 1983-D certified by NGC as 98% Copper and 2% zinc was referred to by them as brass. It weighed in at 3.0 grams. When I asked David Camire, NGC's error attributor, if he considered it a transitional he said he didn't suggesting is was a planchet of unknown origin ... so you have to be careful when all the information about a coin is not known such as the exact alloy. I suggest getting it slabbed again and having a more detailed analysis of what the exact alloy is.