19 3 BX CMC 7 print on back face
Metal channel is 20 inches long
Also looking for the black plastic pieces that hold the window channel in place.
Ivan
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Bob from SWISCO responded:
September 28, 2023
Hey Ivan. I believe this probably either an S380-20 or S385-20 Channel Balance. The only difference between these two types of balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. Compare both with your old hardware to see what matches best. See the illustration below for reference. In either case, for a new stamp option choose 1930. 
Comparison of the S380 and S385 balance shoes.
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