Hello Udo, 
 
I'm not convinced, that this really is a VOC mark. I've never seen any with the O and C overlapping, much less so heavily...  Also there appear to be arrows (which don't seem to vibe with the VOC-V, too). 
 
Any other marks that might fit? 
 
Regards, 
Kai
		 
		
		
		
		
		
		
		
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