Tom from SWISCO responded:
October 20, 2017
The first balance looks like a S385-33 with 3250 option, based on the info provided. If the shoe is 1-3/32" from front to back, that's a good sign. Assuming that the nylon ends are identical between the two balances, then the second balance would be S385-27 with a 2640 stamp option. You can check the stamp options by weighing your window sash.
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