Michael, Lynton McKenzie (sp?) developed a splendid treatment of the SA backstrap that you might consider for this one. He sculpted an initial on the top front portion of the strap, in the center of the wider part of the top of the strap immediately behind the hammer. He then further extended the semicircular lines of the sides of the top edges so that they met smoothly at the rear in a continuation of their curves, forming a sort of island behind the hammer with the initial in the center. He then developed this theme further by lowering the background and adding various elements of interest such as scrolls and a border and background pebbling. I have his engraving tapes and I believe this is where I saw this treatment, I'll try to get a pic for the group later.
Regards, Joe
