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M1-1-5 US ARMY OPTICAL (early)
 M1-1-5 |  side |  newspaper |
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M1(a1)-1-5 US Navy OPTICAL
 m1(a1)-1-5 |  side |  canister |
|---|---|---|
 rear |  valve marking |  mask markings |
 carrier |
M2(a1)-10a1-6 USA OPTICAL SERVICE
 m2a1-10a1-6 optical |  m2 side |  inside |
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M2-10-6 USA OPTICAL SERVICE
 m2 optical |  m2 inside |
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