I just searched "Anchor Hocking Royal Ruby" under images.
The full name of the company, and their name of the colour.
With the quotes, to restrict stuff.
I've just tested it. Images come up. If you click on one a bit comes up at the right hand side with a box saying visit. But underneath that, a ton more images come up.
I found a vase that has the impressed mark in the bottom. It's an anchor. (knock me over with a feather!)
https://www.ebay.co.uk/itm/133646095454I know we do have a wonderful essay about the making of pressed glass stored away carefully in archives, written by a very highly skilled worker, for us.
There are videos of mould blowing and hand finshing on the tube.
If you are interested in glass, the first thing you really need to do is learn how it is made. Grab any opportunity you can to watch it live. Once you have a good grasp of how diffficult or easy something is to make, you have a much better grasp of the quality.
You also need to get out and about and handle as much as you can in markets, fairs and shops and talk to the sellers to find out what they know.
I'll see if I can find the essay. It is NOT boring.

There is more in the discussion too.
Tada!

(But please do not think I can do searches. This is a huge surprise.)
https://www.glassmessages.com/index.php/topic,570.0.html