Any thoughts for what it's for ?

[gary s]

I have no thoughts on the wrench other than it's a multi tool.
No markings on tool. The square holes more like for square headed set screws to lock in place .

[Lostmind]

Maybe garage spring adjuster?
Check google

[Yadda]

I've seen similar bicycle tools.

[Auggie07]

It is a spanner wrench with different wrench sizes. I've seen some similar for use on oil drain nuts.

[lptools]

Maybe a welder's tank wrench? Spanner for the gas bottle caps?

[gary s]

Maybe it's a old automotive hub tool I've seen some that kinda look like it.

[Bill Houghton]

Any number of possibilities.  I've seen similar wrenches that are, I believe, intended for commercial door closers.

[Model 12]

It's a Hook Spanner or  Pin Spanner. The way the hook/pin seems rotated inward, maybe  it's a Collet Chuck Spanner. The regular Pin Spanner likes to slip from the hole in the chuck. If it's like the picture indicates, it'll hold the curve better

[amecks]

This is a "door closer adjustment wrench".  Fairly common item.  Google it or type it in ebay.
Al

[lptools]

This one is for a Norton or Yale closer, similar wrenches by Corbin/Russwin.