Provided that your top guide isn't missing any pieces, this looks to be a Series 351 or a Series 390 balance, specifically S351-33 or S390-33. The printed code suggests a 3250 stamp option, which can be verified by weighing the sash. 3250 will only work if your sash weighs between 28 and 32 pounds.
To choose which of the two Series you need, measure the shoe as shown below. The 1" shoe is for Series 351, and the 1-1/8" shoe is for Series 390.
Comparison of 15-001 & 15-002
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