HARRINGTON & RICHARDSON Mark III - One Inch

[survivalrescue]

Through the 1920's, when the USAAC was in search of a suitable projector for aircraft, they used a variety of commercial types. These were all typically the 25mm types (one inch) or 10 gauge pistols. They had no universal standard until the adoption of the M2.
Those longer barreled H&R pistols were intended to fire a parachute type signal as well, which used longer cartridges. This basic data sheet from the USAAC illustrates some of this pistol. Note the "A" signifies Alloy or aluminum, The bars version seen above was technical "B" for Brass.

[signalman]

I have 3 Mark III Brass examples. One is Navy marked, so they were probably made for more than just the USAAC. They are quite difficult to find.

[survivalrescue]

I found vague reference to the US Navy purchasing other models outside of the Remington Mark-III. I only mention the Mark-III since I'm referring to post WWI. At some point, Remington stopped making the Mark-III and to supplement demands, was when the Navy purchased other models to supplement demand. The cease of production, that I gathered, was sometime in the latter part of the 1930's.
It is interesting to know about the Navy marked H&R pistol.