"What's the heat lot number in that helmet?"
Recently, a high level of importance & significance has been placed on the little fine line alpha numeric code stamped inside the brim of the M-1 helmet. Maybe it is the sheer number of helmets I've had pass through my hands, but I don't place a great amount of importance on these codes. Nevertheless, I began to notice the trend in the helmet community of cataloging these numbers and using them to date a helmet, discredit a helmet or to enhance profit in auction descriptions...
M-1 Liner Body - Accessory or Excessory?
In 1945, experimentation was carried out to determine what the M-1 helmet would be without a telescopic liner assembly.
One of these things is not like the others
Nylon Combat Helmet Liners
For years collectors have been upset with sellers when they purchase a M-1 helmet with nylon liner and discover that the liner doesn’t fit right in the helmet. What these collectors don’t know is that soldiers being issue these helmets complained to the Army about the exact same problem.