Hello, I believe I have an S380 or S385, but I can't tell the difference

A handy person from Sacramento, Ca says:
September 3, 2020
Hello,
I am interested in purchasing two of these replacement Channel Balances. The dimensions are: 28" x 1/2". I'm not sure if these are S380 or S385. Thank you for any assistance!
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Bob from SWISCO responded:
September 9, 2020

This does indeed appear to be either an S380-28 or S385-28, with a stamp option of 2740. The difference between these two balance Series is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. The illustration below depicts this for you. 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
28" Series 380 Channel Balance
28" Series 380 Channel Balance
S380-28
$10.97
28" Series 385 Channel Balance
28" Series 385 Channel Balance
S385-28
$10.97
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