The story behind the 6536/1 with III-57 caseback and 306.xxx serial is that the owner read an article in the Dutch newspaper by Schaap & Citroen jewelers asking owners of submariner to come back and change it to a less active / radioactive dial version. There where a total of 9 around. This was in the Netherlands around 1960, i have the signed receipt of schaap & citroen...during changing the dial to a lower radiated now 2 colour gilt dial, he got changed the winding crown too, old one is on receipt....;- ) Now the 6536/1 has a gilt dial with silver dept as prior it was in all gold print. These old 1 colour printed dials had a 10 times higher radiation then the later 2 coloured gilt dials. Rolex was calling in their sub owners to change the dial as first reaction of the danger of radium. This later's a kind of mixed lume is still active under light and if one doesn't know this look one could point out a relume but it isn't. It's seen on dials from '59-'60. So theoraticly the 2 coloured gilt minutetrack dials are first service and later standard in production. Once we hit '62-'63 the radiations goes down by 5 times less Swiss T<25...
first 2 coloured print...
one colour print 6536...
One the right the 2 coloured printed dial and left the 1 colour print.... As the lume was much higher one the first ones the laques of the dial is mostley damaged by the corrosion. ...
[/img] First generation Radium dials....
Rgrds.Philipp This message has been edited by DrStrong on 2009-04-28 01:17:28 This message has been edited by DrStrong on 2009-05-04 00:46:57