Help validating the eBay Rolex..

[rolex170]

Hi all! I was eyeing this air king but something seems off. I was hoping some experts on here could share their thoughts on the authenticity...plus educate me on Rolex history.

http://www.ebay.com/itm/320952147650...9#ht_512wt_922

First, the serial number is 5 digit (64658). I'm guessing it's very vintage (1935?)....yet the watch dial looks more like a 14000 than a 5500.

Second, the movement shows 1520, but I read that the 1520caliber was introduced around 1963.

Maybe it's just me, but the watch just looks really new for a 5500. I think it's a genuine air king, but maybe a frankenwatch? New dial...maybe replacement movement? Since I don't fully trust all the stuff I read online, maybe someone can provide more insight? Btw, seller has 100% feedback so i don't think it's a scam...

Thanks again!