SBSK is the very first Bittergame SK.
The photo shown is a SBSK with full drop point. It has a tip rise of approximately 0.5 inch.
The word "unay" as translated by google is "concrete".
Not so long ago, unay is the norm in making steel spurs for cockfighting in the Philippines. The spur fork base and the spur point are one piece.
Nowadays, the fork weapons are made by brazing or soldering together the spur fork base and the spur point. These two pieces can be made by specialists separately.
Photo shows unfinished unay (one-piece) Fork (Mexican) Short Knife and unay (one-piece) Fork (American) Long Heel (Gaff).
Fork (Filipino) Long Knife is not shown.