The pressure in my house seems to have dropped, so I called my City Water department. They came out and tested it, and said my regulator must be bad. So I dug it up, and found it's one I've never seen. It doesn't have a screw/bolt on top. It could have broken off, but it's hard to tell with the dirt. There is something that looks like it could turn, if you had a special star/hex/torx/allen bit.
In general, it looks similar to a SharkBite 3/4 regulator. I did make a letter P on top, right were it starts to curve down.
So any thoughts? Here is a picture of what I have now.