Besides the top being removed and the inside looking brand new, the light reflection patterns on this can just didn't look right to me, so I started looking closer. If you "supersize" image #6 you can make out a faint line between the front and back green lines in the center of the can. This faint line is connecting the front and rear lines and shouldn't be there. Maybe I'm just very paranoid now. The seller claims it's original but just beware.
Item number 170311830215
http://cgi.ebay.com/Tydol-Flying-A-HD-1-qt-metal-oil-can-1950s-Original_W0QQitemZ170311830215QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item170311830215&_trksid=p3286.c0.m14&_trkparms=66%3A4%7C65%3A1%7C39%3A1%7C240%3A1318
