Hullo again, 
 
I was in a hurry before and made a mistake. 
Assuming a bedor/paksi/tang of 12-13cm., both blades can be called 'Bangkinang' based on length only. 
Also: 
Cannot see from pictures, but if the gandi (front part of base of blade) of the longer one has a tikel halis/eyebrow shaped like an inverted comma, then it has the 'Bangkinang' form. 
But, the thick tang makes me ask: maybe it is a Peninsular version ... or a revised keris ageung/large Wetan/Jawa? 
Bahari should have the same form as Bangkinang, just shorter. So I am suspicious of the shorter one. Is it Bali/Jawa keris? 
 
By 'duyung teeth', I assume you mean the male Dugong tusk ivory. 
 
About keris executions: 
 
Traditionally keris executions were done with keris as a mark of respect and with no specific form of such keris. 
Execution was done from the back. 
 
With the long keris, execution was done from the collar-bone area. 
That is why the long keris is called 'penyalang', from the word 'salang'... a corruption of the word sasalang/clavicle/collar-bone. 
 
Best
		 
		
		
		
		
		
		
		
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