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Forum Rules. Remember Me? Results 1 to 10 of US M1 helmet: date of manufacture. US M1 helmet: date of manufacture hello, i read somewhere that there is a way to tell the approximate date of manufacture by looking at the number under the front visor of an m1 helmet. This chart is approximate only but, it will get you within a few months time of manufacture. Since this chart is copyrighted material, I don’t think I can post the chart here but, I would suggest for any collector to purchase this book.