Heavy Duty Channel Balance

A contractor from Virginia says:
September 15, 2020
The sash about 40 pounds
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Bob from SWISCO responded:
September 18, 2020

This looks like an S770-36. It believe it will need to be custom made for its extra-strong spring strength. Can you confirm for me that the stamp code reads 3621DS? It's a bit faded in the photo. Many thanks. 
36" Series 770 Balance
36" Series 770 Balance
S770-36
$13.87
How to replace a tilt-window channel balance.
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