Leaking PRV from the90s

[Bob from accounting]

We have a PRV that is leaking from the body.
This configuration from top to bottom is all from the 90s and I was considering replacing this entire line of fittings. From the shut-off all the way up to the T and the bib.
Does anyone have any tips or thoughts on doing this, and if we need to rethink this existing configuration and do it differently? Or copy it fitting by fitting?
For context, what I can tell you is that the output, downstream, travels 70' from here as one large main trunk of 1 1/4 copper that branches out every 15-20 feet to four individual Units.
However, I am just considering replacing what is pictured and nothing else. At the bare minimum, I could replace just the PRV.

 

[Reach4]

What is the brand?
Is the leakage between the metal and the black cartridge?

 

[Sponsor]

 

[Bob from accounting]

What is the brand?
Is the leakage between the metal and the black cartridge?

I am unfamiliar with the brand, nor do I know which brand it is. I could investigate this further by trying to see if I can find a label.
It seems similar to this one on the market. However, I was considering a different brand and even a non-dial PRV. Something more traditional? But I am new to all this, which is why I am putting this out there.

 

[Reach4]

The name cast into the housing looked like Honeywalz Braukmann to me, but Honeywell Braukmann makes sense.

The line under the arrow looks like it ends with "1 1/4"

https://www.supplyhouse.com/sh/control/search/~SEARCH_STRING=honeywell%20braukmann