
Schaeffer groups
If your snap button is engraved with Schaeffer or SHB — SWIP, then the hardware were made by Schaeffer group, originally a German manufacturer, Schaeffer-Homberg that Schaeffertec-Scovill bought, then bought by
Prym group.
Most likely, SHB stands for Steel Hardness reading measure on the Brinell Scale, SWIP stands for Steel-Weighted Industrial
Production.
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