M2-10A1-6 Lightweight Optical Gas Mask | Gas Mask and Respirator Wiki | Fandom
M2-10-6 Army Lightweight Optical Mask dated May of 1944 (info in comments) : r/gasmasks
OLD VIDEO) U.S. M2 Optical Series Masks (Completed Restoration) - YouTube
Body Glove Adult Aquatics Series Optical Professional Mask With Corrective Lenses in Mild, Medium and Strong Strengths (Body Glove Optical Mask, Yellow Mild Strength, Yellow) - Walmart.com