Need help identifying old valve

One of my rental properties has a leaking shutoff valve for the Evaporative Cooler. Instead of the typical 1/4" valves, whoever plumbed this place used what looks like an old single handle shower valve.
It's a long stem valve inside a long brass body. Instead of having a packing nut that I can use a regular wrench on, this has some kind of internal nut/cartidge that looks almost like a Moen cartridge. The type that uses a tool that looks like a pipe with a large slot cut in the end.
However, because of the long stem none of the Moen tools I've seen will fit on it, and it looks like it uses smaller "ears" that the Moen tool.

Any idea where to find the tool I need for servicing this, or at least what the name of the tool (or valve) would be so I can google it?

Thanks in advance.
-Pete.

pictures?
Descriptions are helpful, but some time you need more visual.
Kind of like going to a strip club and all the girls are dancing behind a solid wall and you can only hear the music.

I'll try to get a picture later today, like I said it's at a rental. I wasn't expecting so much trouble identifying it (already spent over an hour on google) or I would have taken a picture yesterday.

I was trying to think of something similar to the Moen you described. I know plumbers that have no clue about the tool you’re talking about. So I’m a little impressed on your description.
But I’m drawing a blank.

Just occurred to me. There is one similar. The diameter is much larger and the pins on tool is smaller and the tool is shorter.
I have this tool I described but I’ll have to think a bit to match it to a brand name.