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It's an LG Dual Up (you can find the info in some earlier posts)

Technically it's 8:9 so not a perfect square, 2560 x 2880

https://www.lg.com/us/monitors/lg-28mq780-b-dualup-monitor

Indeed, it is a DualUp -- the best display I have ever owned. I love it so very much, I planned to get a spare for when it dies, before they EOL'ed it. (I assumed it would not last long, as there can't be widespread appeal for such a display.) I missed that chance - but after months of setting eBay alerts, I found a local teacher that had a used one with just 400 hours on it (I have 17,000 hours on mine), and I bought it ($50 above retail price) and have it cleaned and waiting in a cloth sleeve for its time to shine, one day.

I talk about it and using it on a Mac with HiDPI display modes in this blog post from several years back:

https://bytecellar.com/2022/11/08/4k-scaling-is-not-a-proble...

More photos of the DualUp can be seen in my Mac Studio photo gallery, over on Flickr:

https://www.flickr.com/photos/blakespot/albums/7217772030208...

discontinued and going for almost double the msrp on ebay, alas

And as I see there is no modern high resolution 1:1, 5:4, or 8:9 monitor on the market

Indeed not, sadly.

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