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T206Collector...your piece is a reprint. I know this because you do not own the only known example and because you decided to write a post seeking to verify whether yours was authentic. People with authentic six figure cards do not have to seek information on their authenticity and anyone seeking help to authenticate a Wagner (let alone a proof Wagner strip) lacks the background necessary to actually have snagged the real deal. Is it possible you got lucky on ebay? Yes, it is theoretically possible. But you have a better chance of winning the Megamillions lottery than you do of acquiring the second known (currently unknown) Wagner proof strip. If you own an authentic T206 card you would be able to confirm this based on the quality of the cardboard, font size and color, borders, ink syle and usage, etc.
In short, if you have to ask whether something you own is a reprint, there is an overwhelmingly good chance that it is. And whether or not "reprint" was written on the back is totally and 100% irrelevant.
Sorry to be the bearer of bad news. I hope this does not discourage your collecting of vintage baseball cards and that you will continue to seek information from the writers on this board and through the development of your own collecting prowess.