Reddit reviews Plumb 16 oz. Prospector's Hammer with Hickory Handle - 11493
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Quality Red Hickory handle.Forged head with black epoxy powder paint finish on head.Polished face and chamferPermabond construction between head and handle.16 oz
Eastwing makes a very similar rock hammer. The only difference I see is the width of the face, which could be done with 10 minutes of grinding on a belt grinder.
ETA: you might start with this