It's the 7A160 model based on the E.V 645 model. This one happens to be not be one of them. The dual switch on the lower pistol grip was intended for High and Low Z depending on the users needs. As seen in the pics provided the mic does have wear in the form of scratches, scuffs and small spots of pitting but overall one of the nicer 645's I have personally seen and I've only seen 4 of these before.
eBay