Your harness hammer is a workhorse in your tool box. Use it to hammer wet leather into shape, tamp down two pieces that are glued together, create creases and also to flatten stitches.
This harness hammer has a convex head and second smaller striking face on the opposite side. It is light in weight to prevent marring the surface of your piece.
Marteau Rivoir Harnacheur No. 3
23mm diameter head
230 grams (8.11 oz)