Only marking I can see is "TRUTH"
Problem appears to be the plastic slide (cracked, no longer attached to the arms)that accepts the two arms guiding the correct angle / opening of the Window.
Slide rail on the bottom of the apparatus is 12" in length.
Operator (inside) apperas to be in the middle of the window, looking from the inside of the house the hinge is on the right side of the window.
If needed I can pull the part and send it in.
I'll be sending in an order request today for a half dozen Tie Bar Guides (39-448).
Thanks for all your help.
Jeffrey