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			Hi Norman,I am inclined to believe that these 'dhup' are typically backswords (SE) as yours and Rick's, it seems other examples I have seen are single edged.
 
 From the blade appearance of Stu's I am suspecting this is a double edged blade, note the fullers are centrally placed.
 In backswords, the fullers are of course inclined toward the back of the blade with the blade resulting in more of a 'wedge' shape.
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