window balance identification

Quick Learner from Dublin CA
Metal length is 30 inches.  The marking is 29 3 BV CMC 7.  
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Bob
Bob from SWISCO
SWISCO
Expert

Hello there. Start by comparing to the S380-30 or S385-30. The only difference between these two channel balances is the shoe depth--see below. For a stamp option choose 2930.

Comparison of the S378, S380 and S385 balance shoes.
Comparison of the S378, S380 and S385 balance shoes.

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