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As Jimmy says guys, they are pro strops,Look for them,they sometimes pop up on the bay,N.O.S but they are not cheap for one in prestine condition.
Will a nice, Real shell give you better...

Those are all fantastic strops,I do not care about the linin as I never use it,refurb the leather (no Sanding) High tallow soap, wine bottle, let dry.
Great find.