Often see people ask what the purpose of a diagonal peen hammer is. Here is a double diagonal that works for both left and right handed smiths. People seem to like them.
Nathan Robertson Double Diagonal Hammer — Old World Anvils
Diagonal Peen Hammer, 2.5 LBS, Northern Iron Forge, LEFT handed - Nordic Edge
Double diagonal peen hammer, just finished. : r/Blacksmith
Diagonal Peen Hammer — Meader Supply Corp.
finishing the Double diagonal peen hammer part 3 - YouTube