That is a beautiful gun and set. Only thing that I can think of is it must be in conjunction with implementation or installation of those tubes. Those in combination with another tool must have some sort of application. Those are the only big enough items that it would appear to involve a wrench of that size. Or something to do the with the hammers. These are Captain Obvious points though.
Maybe it has nothing to do with gun and it was just a spare wrench to throw in gun case to tighten a buggy wheel nut. I have seen some square buggy wheel nuts that would fit.
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