Hello,
I'm new to this forum and saw your post while perusing the site. Its been a while since you posted so not sure you'll see my response. Some vintage parametric EQs were made by a high end company called SAE. I have their 1800 model which I've been pleased with though I don't use it much anymore. If you're interested I might be interested in selling. They made a couple of models over the years. I think they made a 2400 as well which was more expensive. Good luck.
Matt