Not a bumper, this one has the 501 or the 510 in it (can't remember which) so it's a full auto. The lume on the hour hand has been redone which was the obvious thing (given away but the differing colour lume on the dial). The hands I believe are Omega hands (as shown here http://www.ofrei.com/page764.html). As a rule of thumb, if there is lume on the dial, the hands should be lumed as well. The crown is the correct style (clover leaf) but it is a service replacement. This is more obvious if you see the face of the crown as it has the newer logo on it but it can also be seen from this angle as the edge next the case isn't flat so it doesn't sit quite flush with the case. The last thing, which is quite hard to tell from pictures is that the crystal has been replaced at some point. The original should have a very small Omega logo on it right in the center. This can be hard to see unless you are viewing the watch at the right angle. This watch highlights that you have to do your research if you want and an all original watch because at a cursory glance it looks ok. Getting a non original one is a OK too but its good to know what you are buying so you can make sure you are not overpaying.