Hi, this is the channel balance from a 1980's vintage window.
The stamped numbers are " 4490 34 " . The "44 " matches the measured size of the window and is consistent with the length of the channel which is 45" .
The " 90 " I believe is the weight code of " 9 " and is consistent with the weight of the sash of approx. 30# .
Do you have a series 390 channel that is 44 5/8 " to 45 " in length with the 19.002 top and and the 15-001 bottom hardware .
Thank you,
Gary