Sounds like Eau d'Hadrien if it is EDT and no staying power, but then again with Ebay and this being 25ml, anything could be inside it. Only thing I could suggest is to go to a shop near you that sells Eau d'Hadrien and have a sniff at the real thing to see if it is similar to what you've purchased.
If it's the same bottle as http://cgi.ebay.co.uk/ANNICK-GOUTAL-...item4aa01b425d I've never seen anything like that before, the bottle and labelling look ancient and that one certainly isn't Eau d'Hadrien