Most places stock Chicom or the “DIY” grade BrassCraft 1/4 turns. I read Oatey bought out Keeney and Dearborn Brass.Follow up. It appears that the shut off valve is cracked and leaking on one side. I can't imagine how this happened unless it is because it is a cheap make in China cast component that failed at a seam. I double checked and the water droplets are not emanating from the feed line connection. Also on this model from Keeney there is no packing nut assembly.
So it is off to the hardware store and hopefully they will stock a quality brass valve with chrome plating. This Keeney valve may even be made of plastic. Here's a pic. You can see a drip heading down the left side of the valve.
if you can get one of these, it’s 99% as nice as the Dahl without having to call every supply house in town.
https://www.brasscraft.com/product/12-in-nom-comp-x-38-in-o-d-comp-6/