Al,
Be aware that some of the best engravers in the world do not use engraving hammers. Many make their own, use small ball peins, or use other small, readily available hammers. For instance, view this video of the Browning engravers and note the hammers they are using. They are common to those used by many European engravers.
The old adage is....whether one uses hand, mechanical, or pnuematic driven tools, it's not how the tool is driven, but who's doing the driving.