Tom from SWISCO responded:
August 25, 2017
Hi, Jalal. "31 5" is a manufacturer code that refers to a 32" balance with a 3150 stamp option. As for the Series, I can tell from your plastic attachments that you need Series 380 or Series 385. Take a look at the photo below to see how you should measure. If your shoe is 1-3/32", you have the S385-32. If it measures 1", choose the S380-32.
Alternate view of 15-004
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