Cupping tool - popular for forging the face of rounding hammers.
This  semi  spherical  swage is also useful for forging spoons, candle pans, floral forms etc.

Heavy forged 4140 steel on a one inch hardy stem. Other hardy stem sizes available on request .  These are 3 inches in diameter and about an inch thick with a 2.5 inch depression Available for local pick up at front step forge or online here .

Need a size not listed ? Email me spc@fronstepforge.com