Front 1958 Super Speed (D-3) then 1954 Super Speed (Z-3). Note the vertical knurling and flared TTO on the 58 compared to the smooth knurling and smaller TTO on the 54. The 58 TV Special is the only 50's style S-Speed (Gen 2) w/vertical knurling. All other's have a crisscross design. Both 1.99oz.
