With regard to the second dagger, I found a very similar example on Artzi Yarom's old site. Here is what Artzi said about his knife:
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				... this authentic dagger of the Shona people residing in Zimbabwe and South  Africa. It is of the classical Shona dagger shape, straight blade 9 ½   inches long, with almost parallel edges, tapering to an acute tip in the  last three inches or so. The blade is step folded longwise and  decorated with black patina on one half. Hard wood handle and scabbard  bound with twisted and plaited copper wire. Total length 15 inches. ...
			
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 The description and pictures fit my second knife very closely, including the "dark patina" referenced by Oriental Arms.
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