I think M Eley might have cracked it! 
 
I was going to reply to this thread this morning, but computer threw a fit. 
And I Was going to say that  it reminds me of a boathook,  but shank is much too short. 
 Then,  I thought maybe a boarding axe, as such items were weapons as well as tools. 
Also wonderd vaguely about a fireman's axe...18thC or before.... 
 
But I think M Eley may have put all this idle conjecture to rest! 
 
Richard.
		 
		
		
		
		
		
		
		
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