Hi Green,  
 
I think what you meant by "not form the Malay world" is not from Peninsular Malay world? Because this type of blade is quite popular in Sumatera. Attached below is a gift from the Sultan of Inderagiri to Capt Rich Swan (I forgot the actual name) in 1649AD. 
 
Anyhow I am curious on the shape of the rounded sirah cecak. Probably it's a Tuban sirah cecak? Maybe other forumites can shed some light on it.
		 
		
		
		
			
		
		
		
		
		
		
		
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