Hi Jim, 
 
yes I noticed the lines on the back of the hilt, I have no idea why this is done.There are on this blade remains of crossed anchors with a double A 
of the admiralty of Amsterdam. 
Below a date, unfortunately only the one and the six are legible.see picture  , for another AA example of the a similar etching. 
 
it looks as though the date is engraved on early houwers before +-1740 and stamped on the later examples. 
 
best, 
jasper
		 
		
		
		
			
		
		
		
		
		
		
		
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