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Assuming that the mast is a Dwyer DM-1, it is about .5 1bs per foot. Here is the factory spec:
http://www.dwyermast.com/items.asp?cat1ID=20&cat1Name=Masts&familyID=31&familyName=DM-1+Mast
DM-1 Dimensions: 2.00 in. x 2.25 in. Weight: .533 lb./ft.
You'd then have to add a little for the hardware and stays.
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