Thanks for the reply Marcello.
Now back to the initial debate:
Here are more of the infamous open 6 mark IV dials I've spotted on the net. The serials range from 5.39mil to 5.78mil and one even states punched papers putting them all in the 1978 range. Do you see a pattern emerging? :
1. 5398804 serial on e-bay:
http://www.ebay.com/itm/ROLEX-SUBMAR...tem27bce2a4881
2. 5.4mil serial on E-bay:
http://www.ebay.com/itm/Rolex-Submar...item4aae5c0d42
3. Punched papers dated 1978 on Chrono24:
http://www.chrono24.fr/rolex/oyster-...esultIndex=138
4. 578... serial from Italy on Chrono24 (The pic is lousy but its the "Mark IV" allright):
http://www.chrono24.fr/rolex/rolex-s...ch%2Findex.htm