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 .
Maybe garage spring adjuster?
Check google
I've seen similar bicycle tools.
It is a spanner wrench with different wrench sizes. I've seen some similar for use on oil drain nuts.
Maybe a welder's tank wrench? Spanner for the gas bottle caps?
Maybe it's a old automotive hub tool I've seen some that kinda look like it.
Any number of possibilities. I've seen similar wrenches that are, I believe, intended for commercial door closers.
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
This is a "door closer adjustment wrench". Fairly common item. Google it or type it in ebay.
Al
This one is for a Norton or Yale closer, similar wrenches by Corbin/Russwin.