Catalog Description (from when I bought it in the early 1980’s) :
The SUPER-PRO Model 80 is the ultimate achievement in advanced design and development of the famous professional throwing knife line by Tru-Bal. It provides sportsmen and professional throwers alike with a knife for precision throwing that combines perfect center balance with the exactly correct length and weight for proper target penetration and maximum control. It throws equally well by handle OR blade in the professional style of throwing and is 13 1/2″ overall, 2″ wide and 3/16″ thick. Knife weight is 15 oz. Please add $4.00 if a strong leather sheath is desired.