The "Raskas Sinko" (eng = "heavy recoilless weapon") also known under it's nickname "Musti" (eng = "blackie") was developed in 1958 and it was given a new wheel-equipped carriage in 1961. The designation "95 S 58-61" refers to "95mm, Sinko, model 1958/1961" ("Sinko" - eng = "recoilless weapon").
