Early 1970's construction.
Non-tilt, 1/2"(9/16")channel
920 stamped/punched into frame, nothing else.
Top plastic piece has a small "tit" that goes into metal piece in window frame. your 700 series top end has a "tit" but bottom is completely different.
No take out clip in frame - see image for holes in my frame.
Metal part of channel = 29 5/8", Total length with plastic ends including "tit" = 31" of which 1/8" is the "tit".
Weight of window is 12 lbs without channels.
Plastic top piece= 1 1/8" long beyond end of metal (includes 'tit"), 9/16" wide, 11/16" deep front to back.
Plastic bottom piece 1/4" long beyond end of metal, 9/16" wide, 15/16" deep front to back.
Brian
