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Colt McClellandI have owned both the E90-2 Wagner and the E104 Nadja Wagner (blank back version). Both cards show the same portrait on the front. My experience is that the E104 is much more scarce than the E90-2. Also, I have only seen the E104 Wagner with a blank back, although the Nadja back version is known to exist. E104 Wagner with the Nadja back would clearly be up there on the list of most scarce Wagner portrait cards.