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Just google Panama Hone and youll see some examples...these Versions seem to be early Versions of that barber Hone which did not have the embossing....i could be well wrong but it looks most likely...

Its a Barber hone and most likely a Panama Hone. They existed with in different Versions. One with two synthethic sides and another Version with this patterned side...the discussiom was always if...