Original U.S. WWII Experimental T19E1 Tank Crew Helmet Liner with Chinstrap Russian Maxim 1910 The barrel and cylinder are

The barrel and cylinder are worn and corroded to the point where it is hard to find the engraving and the cylinder has also lost the serial number from corrosion as well

This rested on the powder charge encased in a paper envelope

The lock is marked TOWER / 1862 below the cap bolster

Here's an excerpt on flag signals

because of the greatly increased time to machine them

Original U.S. WWII Experimental T19E1 Tank Crew Helmet Liner with Chinstrap Russian Maxim 1910 The barrel and cylinder areOriginal Item: Only One Available. Now this is a rare bird! This is a very nice "high pressure" helmet liner, designed to be used with the T19E1 tankers helmet, which was never actually put into production. These liners are quite rare, and this is an exceptionally good example. Many were used for training post war, which subjected the liners to quite a bit of wear and tear. There were no replacement parts, so they could not be repaired. This example