Blackjacks and Coshes were carried by many Sailors, Dock Workers and Policeman in the 17th and 18th Century.  These are weapons.  The Flexible Shafts were usually Baleen Whalebone or a type of Metal Spring.  They were Bagged and Loaded with Lead Shot or just a Lead Ball.  They were then covered with Leather Braidwork or Hemp Cordwork.
 
The Blackjacks and Coshes pictured here have a Flexible substance much like Baleen Whalebone for the Shaft.  They are Bagged, Loaded and Balanced with 7 oz of Lead.  The covering is Hemp and Cotton cord preserved with well cured Stockholm Tar. The Knob Knots are very Fancy Turks Head's and the shafts are done in a Whipmakers Plait or a French twist Braid. They are about 11" in length and have a 7" wriststrap.  I have been able to handle and examine some old pieces and these are very accurate reproductions.  I sell these to Collectors and Re-Enactors of this time period.
 

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    11" Coshe with Grapevine Braid on Shaft

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      11" Coshe with Plaited Shaft and 6" Wrist Strap

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    10" Gangster Style

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     Knob Knot covering a bagged and Leaded End

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     Shaft is covered with a Whip-Makers Plait

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    Knob Knot covering a Bagged and Leaded End

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    Knob Knot Covers a Lead End

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   Plaited Shaft and Hand Strap

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    Knob Knot cover on Lead End

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     Assorted Blackjacks and Coshes with Flexible Shafts and 7 oz. Lead Load

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     10" and 11" Coshes with Flexible Shafts and 7 oz. Lead Load

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            Police Nightstick and Daystick 22" and 15"