Internal marks = 1620 80714 and across between numbers looks like b.s.i. ?

A quick learner from Illinois says:
October 18, 2021
Hi
Maybe 17" series 370 channel balance ?
Non tilt
1/2" width (9/16)
But is option 1620?
And order two?
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Lauren from SWISCO responded:
October 22, 2021

Hello, thank you for posting! 

Yes, your balance does resemble our series S370-17 and the stamp option needed would be 1620. Please confirm the length from metal to metal is 17". We do recommend replacing both balances at the same time as pairing a new balance with an old one would cause the new balance to wear out faster. 
17" Series 370 Channel Balance
17" Series 370 Channel Balance
S370-17
$9.62
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