I would not refer to the pattern on these blades as "ladder pattern".  Typically, a ladder pattern is on a wootz blade, with ladder "rungs" that stretch the length of the blade in a regular and repeating way.  Dave's blade is not wootz.  It is a pattern welded blade and while you do have a repeating pattern, it is not what I would consider a ladder pattern.  I do believe the pattern created here is a manipulation of the layered blade.  Same on a ladder pattern in wootz.  It is manipulated through the forging process.  It certainly takes a bit of skill to forge, fold, manipulate and hammer out a pattern welded blade where you get such a bold pattern.  While not what I would consider as a ladder pattern blade, it is a lovely example of Indian pattern welding.  As far as an estimation of age, I would guess Dave's tulwar to be early to mid 19th century.
		 
		
		
		
		
		
		
		
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