I hand forge a single face, Japanese style hammer which some call a cutler, dog ear or dog head hammer. The eye is placed towards one end. This creates a dropping effect when swung making this type of hammer easy on the arm.
My hammers are ~ 2 pounds, made from 32mm x 110mm YK30 steel - a Japanese steel similar to O1 and is very suitable for quality hammers.
For handles I use guava tree wood which is commonly used for tool handles in Asia. I shape the handles to be ergonomic based on if you swing a hammer right or left handed. I feel my hammers are top quality - hand forging improves the form and function.