I believe that the condition of the Obverse vs the Reverse is that the coin was mounted in a sealed back Bezel and worn. The Obverse received wear from being worn and handled but the Reverse was totally protected from wear. Due to the amount of wear on the Obverse and it's appearance, the Bezel containing the coin was probably attached to a Pocket Watch Fob. Overall it is a nice coin but because of the road rash on Miss Liberty's jawbone and neck, the wear and nicks as well, the nicks on the denticles at K3:15 and K8:00 as well as the mottled toning, it lacks eye appeal for a higher grade and thus I would only Net grade it as EF-40!!!!
Frank