Tom from SWISCO responded:
February 19, 2018
Thanks for all the info! If the shoe is definitely more than 1" or 1-1/8", then it's probably the shoe shown below, which is the Series 385 shoe. If the channel is 22", that corresponds to the S385-22 balance. Your stamp "21 4" is often related to the "2140" weight option, and sure enough, our 2140 option holds sashes 15 to 23 pounds in weight, so that would be right for a 15.5 lb sash. Choose 2140 when you make your purchase.
Comparison of the S380 and S385 balance shoes.
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