WT ~
Interesting ...
I have no clue what it might be, but thought I'd share the following for those like me who didn't know what a "Billet" was. Plus, I re-did the picture as close to actual size as I could based on the fingers.
SBB
Billet:
Noun:
1. A small chunk of wood; a short section of a log, especially one cut for fuel.
2. Metalworking . a comparatively narrow, generally square, bar of steel, especially one rolled or forged from an ingot; a narrow bloom.
3. An iron or steel slab upon concrete, serving as a footing to a column.
4. Architecture: Any of a series of closely spaced cylindrical objects, often in several rows, used as ornaments in a hollow molding or cornice.
5. A strap that passes through a buckle, as to connect the ends of a girth.