Hello all, First post for me since I found this cool site. I love old tools and machines so I suspect that I'll be spending too much time here!

And so for this unusual purpose made wrench / spanner that found it's way into my tool box.
7-3/8" oa length, the open end wrench is 7/8 " , only markings are "326A5" and a letter "F" in a circle. Any ideas as to what or what for?

Joe   in frozen Farmington, Michigan

hi Joe,  welcome to the group,  I am new also, but this is a group of happy, helpfull people,
that when you read their comments, you will want to come back many times.

knowledge ?  take some from them and feed them your thoughts.

now, for your tool,  I do not know what it is, but there are a few people that may come
up with the answer, you will learn who they are.

I love old tools, but the best part is searching their identity.   good luck, Frank

Welcome Joe. I have seen many thousand wrenchs but that isn't one of them. At the local auction they would call it a specialty tool.

Pretty interesting wrench.   From the dark patina, and shape of the jaws I would put it at 1920 or earlier.  With the unusual curved spanner end, I am guessing  it was an specific adjustment tool for machinery.   Maybe a mill or shaper.   With those numbers someone is likely to come up with a response soon.  Nice find.

I have seen this wrench for sale many times. Not terribly rare. Odd none the less though. I've seen the spanner end on water pump wrenchs on 1930's era tractors.

I agree with Carl , looks like water pump packing wrench. If you can't get an ID here , try
" Smokestack " engine/tractor forum.

I've got one like yours, believe it says,Leval on it, or something like that.

Perhaps a DeLaval wrench for one of their cream separators.