I've been restoring my grandfather's copper hammers and mallets. Left is what they all looked like before I started. Not finished yet but they're not looking too bad for 70-year-old tools. :
5 1/2 x 12 inch BERYLCO H45 Brass Hammer - 90654 – Jim Bode Tools
Temco 2 LB copper hammer & Berylco Beryllilum double face machinist hammer USA | #1798114618
Realistic Sledge Hammer Prop - Halloween Express
NGK Berylco H-60 16 Oz Non-Sparking Claw Hammer | Kaufman Company Inc.