Figure 18. RKKA versions of the Russian military ‘Protective Goggles’. Top, the course leather version, introduced in 1934, it was used until early WWII when shortages lead to an identical design using vinyl coated cotton canvas. Note the ‘hinge’ is actually a part of the flexible face mask. The same version was issued until 1954, when cheaper versions appear. Note the middle one is a small size with shorter ‘D’- frames.