another grandfathers Bayo's ID help please

[jmurphy]

My grandfather passed away about a year ago and I am trying to find out some info on his small collection of Bayonets. This is the first one have am trying to identify. The makers mark or mark on blade is a triangle with 3 letters in it AI and one other that looks like a backwards 3 or a b any help on age,maker use etc would be greatly appreciated
Thanks in advance
Also the numbers on it are 98896 I dont know if that helps

[seitengewehr]

Yugoslavian Version of the Model 1924 Long bayonet
for the Yugoslavian Model 1924 8mm Rifle (FN 1924 COPY)
Based on the Original Fabrique Nationale M24 Long Bayonet
triangular Armory Stamping indicates Yugo Manufacturing

[Reibert]

"AT3" (ATZ) Артилерийско технички завод - Artiljerijsko Technitschki Zavod, Kragujevac, Serbia