This one has been apart since June 2011 and is reference 6422, made around the first quarter of 1956, original afaik except for the crystal and crown. The dial is pretty good and the 34mm case is in excellent condition with no corrosion. (19mm lugs). The movement is a cal 1210 17 jewel manual wind.
I paid $350 for it in running condition with a Rolex rivet bracelet in 2011. I've seen a lot of these with all steel cases and goldtone markers/hands but not many tutones. This one had a steel bezel but had a gold crown when I got it. It might have been tutone and someone swapped the bezel but there is no way to tell. Probably go back together all steel.
It is about half way finished and will have a Tropic 11 crystal in place of the T12 in the picture when done. I'll post a pic or two when it is finished. Sooner or later.
The markers and ROLEX logo are embossed, not applied like later models. The back of the brass dial is smooth, no marker feet. The lume dots are radium and still plenty hot, checked with Geiger counter. No glow.
'Stainless steel' and 6422 are slightly tilted compared to the trademark and 'ROLEX' SA.