That would have been a slasher, not a gaff. Slashers were also only used on one leg of the cock, gaffs were put on both feet. Also, for this very reason, the cocks were not handled during the fight if they had slashers on. A slasher was like a miniature saber, and razor sharp. A gaff was a curved steel round spike that would only stab. JFYI..
I just remember that they were on display EVERYWHERE in the P.I.