M 1867 would be the model number and would mean the bayonet could be younger than this but not older 
Fernando is saying cut short and not cut sheet as his text says,just a typo I imagine 
What this means is the blade originally had curve but has been shortened 
Blades with curve such as this we're call,ed yagathan ( not sure on spelling). If the ring is 18.9 mm then it has not been re bushed and would still fit on original rifle 
 
The imperial armies were great re users of weapons an I would imagine this could be wwi as there was lot of re issue to second line regiments  
Hope this helps 
Ken
		 
		
		
		
		
		
		
		
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