Made from 1983 to 1985, the new grind tangs was a Case factory experiment in blade strengthening that was not successful. The satin finish blades were especially difficult to make with the new curved tang grind. But the factory had problems with consistency on all new grind knives. Announced in mid 1983, these were only made for a short time in 1985, with 1984 being the only full year of production. Because of the production problems, however, the familiar straight grind tangs can be found on knives of each year.