What does "cluthback" mean

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Tinnerman Clutches

World War Two Tinnerman Clutchs
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A second, less common clutch type found on some World War Two era insignia are Tinnerman clutches. These were invented by Albert H. Tinnerman (1879-1961), whose company made all kinds of spring steel fasteners for industrial applications. Some of the newer Tinnerman clutches are marked with individual numbers and have a silver finish.
 
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