Little hammer on side to break away mud / dirt clods from the bolt head . Ratchet to loosen nut / bolt . Pry bar to adjust into posion . Flip ratchet over to tighten . Used to use them alot on old farm equipment and trucks . Old air brakes mostly , but the uses were the same .
I would venture to guess it would be used to align the weapon to fire where the sights pointed on some sort of mount .
While not exactly the same some power company lineman who had to purchase their own tools had a similar wrench. The Bell System furnished all tools and employees were warned not to use tools not provided by the company. The only exception was a pocket knife, which for reason not known (at least by me) they didn't provide a pocket knife.
Unusual that they say what it is for right on the handle. Most US tools would just have a part number if anything. Maybe even a Navy item. Ratchet only works one way? thats OK just flip it over and it works the other way. It appears to have been plated. Most GI stuff is phosphate coated, at least the older stuff. More recent tools are often right off the shelf commercial type. Somebody really wanted the user to know exactly what that one was for.
The square drive for a square bolt head or threaded adjustment device is very unusual. Some vintage european tripods and a few european MGs have square bolt head fixtures, but a US "gun mount" with square headed bolts or fixtures is going to be very unusual.
Did a quick search and there are several for sale on the web. Most seem to be phosphate or oxide. One has a drive spud in it with the ball detent for a socket. All are listed as WWII but who can tell. J
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