Very nice and unusual find! 
Etchings on the blade are from the 2nd half of the 18th century. Etched lady is Diane - in Roman mitology godness of forest and animals, always depicted as hunting lady. I can't recognize the second person on the other side of the blade under the sun - the picture is fainted.  
The blade is European for sure, probably even earlier. Open-work - those holes on the blade, reminds me some of the 17th or even 16th century blades, but I think the first conjecture will be closer to the truth. 
I believe the others will tell you more about it.  
 
Regards
		 
		
		
		
		
		
		
		
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