Ok so you've had some time to stew on the other two overnight....(it was night time here in GMT land )
Oooh, two completely different opinions here....well who's right then?
FIRST ONE....
It is in fact an early (1958) 5508 with an aftermarket (MY) bezel insert. Nanuq I was sure you'd plump for 6536 like Nightstroker - the rehaut spot is superb (you remember Billy Crystal's response to De Niro, right? "No, YOU...." )
SECOND ONE...
Nightstroker, that gilt dial with modern text and spec just messes with your head doesn't it?!! A gilt dial in a 1980's era watch? No way is it legit, right? Must be a franken. Or so you'd think... It is in fact completely GEN and ORIGINAL - as my wilderness-dwelling friend has again nailed it, an OBSCENELY RARE gilt dial 16800, made for a Middle East customer