The usage of the term unfortunately got mangled later on, but that's exactly what "flat screen" actually means. 😀
I had a late flat-screened Sony Trinitron but it didn't last long due to some manufacturing defect. For a while it was beautiful though.
A family member had a 17" NEC FE700+ or FE770 or something like that (probably getting the model wrong). It always had a great picture. I'm guessing that FE1250+ is a bigger brother of that monitor.
If you think you can make some money on these then go for it. You'd be the one making the effort, finding space, and taking the risks involved with selling, so you deserve whatever value the market will give you for making these available to someone. 😀 The potential income will vary depending how quickly you want them gone and whether you ship or just sell local (which is less risky and probably easier).
If you do decide to sell them, make sure people know what the deal is with the horizontal black lines. They're normal for aperture grille monitors but some people don't understand that and might file a complaint, return for refund, etc.