I've not been able to identify this "7326 G"  T-wrench.  There are no other marks on this wrench.  Also, this one was designed with enough "shoulder" to resist the distortion common to many cast iron agricultural wrenches of this type.

Maybe Bus can give us his input on it.

Note: My photos placed on this site can now no longer be opened using "Microsoft Office Picture Manager (default).  Instead, click on "Other" and select "Windows Photo Gallery". Then the photo can be opened to full size.

I love T wrenches as well as I, L and H wrenches.