What country or part of the world?
Did it match or come bundled with a specific computer?
Was it sold by a local white box pc maker?
Any store name?

I have encountered a fair number of monitors in the past with a logo affixed to the case but upon further inspection a different brand was on the rear sticker.

I had a vertex branded 14” monitor, it wasn’t actually vertex just had a vertex plate firmly affixed

Good points.
Country: Italy.
Store: it was just an assembled pc, you would go to a store and check boxes out of a paper sheet - how much ram you wanted, vga ega or cga card, monochrome or color monitor... as basic as you can imagine.

So I guess it was just a whatever monitor, with this "vegas" plate affixed.
I suddenly remember the logo was a very stylized seagull, almost just a checkmark of sorts.

Oddly there were a couple pc makers that had a heavily stylized thing that looked like a seagull in their logo, sadly I can’t name most of them.

Olivetti at one point had a thing in its logo that looked like a seagull. Before Viewsonic was actually called viewsonic they had a stylized monochromatic bird thing and there were others.

There is a big chance it was a Taiwanese clone monitor sold under multiple "brands".