I borrowed a frame like this a couple of years ago. It was one from Sears, but no longer made as far as I could tell.
Then I bought a very similar one from Craigslist a couple years ago. I can no longer find the paper with the instructions and the manufacturer's name. I find it easy to use, easy to set up for the demos I take it to. It's been used at a festival of historic arts at an old mill's restoration benefit, in a fifth grade classroom to teach quilting for a day during History Week, and at another art-in-the-park festival, at all of which the public practice quilting on it.
It isn't one I leave up all the time due to space constraints; I use a handheld lap hoop to handquilt.
If you'll google "wood quilting frames" and go into the 5th, 6th and more pages, you might find one similar to yours.
Jan in VA