t_swiss_t
·Over the weekend I was lucky enough to acquire this well-preserved 1960 Explorer 1016, serial 517xxx.
[Spots on the left side of the dial are from dust on the underside of the plexi and are not on the dial]
This piece came from the family of the original owner, the founding director of the United States' first pediatric cardiology program at Johns Hopkins. His family had retained the watch unworn since his death in 1976.
As you might have noticed, the 3, 6, and 9 plots, as well as the hands, are of a slightly different hue than the other markers, which gets more interesting when you highlight the watch with UV.
[Macro with slight UV light exposure:]
[Immediately after UV:]
[20 sec after UV; all lume fades off after around 30-40 secs:]
It appears that the watch left the factory with two different lume mixtures (possibly one radium and the other tritium), which I suggest as original because of their correctly sunken appearance in the plots, the mirror dial without scratches,
the slight radium burns at the edges of the line plots [see 6 o'clock macro, three pictures above] -- but not 3/6/9 plots or on the dial where the hands sat stationary for decades, and the relatively low 0.6-0.8 muSv/hr Geiger reading.
The originality is also supported by the unpolished lugs without spring bar marks,
the preserved outer case back with the lightly etched and uncommon, but known to be factory applied, “stainless steel” engraving,
the inside case back without service marks and melted gasket,
and movement with perfectly preserved rotor and screw heads without evidence of prior opening (and "ROW" US import mark).
It's an interesting piece, and one that bucks the frequently repeated information about when/how Rolex began experimenting and installing newer lume compounds. Though, in conversation with a number of seasoned collectors and dealers, there have been a number of other interesting mixtures of lume on dials from 1959-1963 before radium was phased out altogether. I hope it will foster some conversation.
Andrew
[Spots on the left side of the dial are from dust on the underside of the plexi and are not on the dial]
This piece came from the family of the original owner, the founding director of the United States' first pediatric cardiology program at Johns Hopkins. His family had retained the watch unworn since his death in 1976.
As you might have noticed, the 3, 6, and 9 plots, as well as the hands, are of a slightly different hue than the other markers, which gets more interesting when you highlight the watch with UV.
[Macro with slight UV light exposure:]
[Immediately after UV:]
[20 sec after UV; all lume fades off after around 30-40 secs:]
It appears that the watch left the factory with two different lume mixtures (possibly one radium and the other tritium), which I suggest as original because of their correctly sunken appearance in the plots, the mirror dial without scratches,
the slight radium burns at the edges of the line plots [see 6 o'clock macro, three pictures above] -- but not 3/6/9 plots or on the dial where the hands sat stationary for decades, and the relatively low 0.6-0.8 muSv/hr Geiger reading.
The originality is also supported by the unpolished lugs without spring bar marks,
the preserved outer case back with the lightly etched and uncommon, but known to be factory applied, “stainless steel” engraving,
the inside case back without service marks and melted gasket,
and movement with perfectly preserved rotor and screw heads without evidence of prior opening (and "ROW" US import mark).
It's an interesting piece, and one that bucks the frequently repeated information about when/how Rolex began experimenting and installing newer lume compounds. Though, in conversation with a number of seasoned collectors and dealers, there have been a number of other interesting mixtures of lume on dials from 1959-1963 before radium was phased out altogether. I hope it will foster some conversation.
Andrew
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