Valley/ Eljer, Identification of bathtub faucets

[Beach_Wolf]

Hello,
I am in a condo built in the mid 80's. I don't think the bathrooms have been renovated since then. I have a small water drip from the bathroom hot water faucet knob. The water is dripping from between the valve stem and what looks like the packing nut. (There is no leak or drip from the actual spout.)
The faucet handles look like American Standard handles, but I can't tell what the cartridge is. Any help identifying this system would be appreciated.

It looks like there was originally some rubber packing around the cartridge stem, that's since been corroded.

 

[Breplum]

I don't recognize that brand. The nut is not a "packing" nut, but just secures a cartridge.
If nobody else recognizes it, you may need to turn the water off, pull the cartridge and get a photo and include the overall dimension to help identify.
Google: "brasscraft stem identification" and find the pdf at content.interlinebrands.com
It has 131 pages of stems based on length.
Is that a plastic cartridge ?
Bonne chance

 

[Sponsor]

 

[Marlinman]

This is a Valley/ Eljer shower faucet. There were 2 generations of this valve and both used a black cartridge extension.