I'm thinking It Is The Series 377 balance

A quick learner from Florida says:
May 22, 2018
Please advise which balance you recommend based on these pictures. The length is 30 inches and I?m thinking it is the series 377 channel balance however I am not sure which option to select. The only markings I can find show c 29-1. Thank you.
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Paul from SWISCO responded:
May 29, 2018

I must say I, too, agree with your recommendation. Your balance does appear to look similar to our S377-30. You would choose the 2910 option to correspond with your "29-1" marking. 
30" Series 377 Channel Balance
30" Series 377 Channel Balance
S377-30
$11.52
Top Sash Guide Pair, Pan Am
Top Sash Guide Pair, Pan Am
18-042
$1.97
Pan Am Take Out Clip
Pan Am Take Out Clip
16-023
$1.17
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