It's an Estwing framing hammer. Been out in the side shed with all my other rusting tools for a couple decades. I tried spraying WD-40 like Glade, but it hasn't helped.
I live on the Gulf Coast and my tools want to rust quickly as well. I have found that Evapo-Rust works well.
Evapo-Rust Rust Remover - Evapo-Rust Super Safe Rust Remover