You folks have a history of impressing me with your knowledge of window and door parts. You make me look good to my clients.
Do the attached photos look like Series 751 Channel Balances to you? I don't see any metal channel, either square or ribbed, in the photos I took. Perhaps the channel is higher up in the window frame? I believe they mount in the upper part of the frame, right? I looked around the Swisco site and 751 is the closest I saw. Definitely tilt windows. Plastic frame stamped 30TGB RS, but I don't think that has anything to to with the balances. No window brand visible.
Thanks!
Rich