Hello and welcome to the board.
Thank-you so much for your great photos, posted directly!
I can't help with a maker, but this is a studio glass piece, and it doesn't have "fingerprints" on it.
It has been flattened on the marver to make it square in profile. Flattening the round, molten, blown hot glass on the marver causes those rings to appear.
It looks like you used your email address as your username?
Can we ask you to change it, please?
It is for your own protection - so that you do not get harvested by spam bots.
One of our moderators might be needed to help you with that. I will contact one to ask.
Do not worry about it - we are here to help.