War Hammer?

[C4RL]

Originally Posted by CutlassCollector

there are not many uses for a spike on the reverse of a hammer - mining perhaps

Stone mason's.
Geologist's.
Panel beater's.
Welders slag.
Blacksmith's hot punch.
Piton (climbers).

That's just from memory without Googling.
While I agree spiked hammers aren't common there are still plenty of trades use/used them, many obscure & now forgotten.