Con Nast
22
Hola
I recently discovered that not only they used
Radium as lume But also strontium 90 as lume on the dials.
Switserland used to export strontium 90 for
Medicinal use and for lume . In the late 1950 simport and use of strontium was forbidden in the USA.
Actually it was not the radium which was there biggest concern but strontium
.
The Swiss goverment then sold it to the watch industry for lume .
.
That is when you start to see underlines and dot for the us market and double underline as confirmation of the first underline.
.
After obeserving varios lume and vintage watches
I noticed that strontium lume in dial convertd Into dark green grey brown matter and so does the dial. But glow stays very potent with strontium 90
.
Added to pictures of Strontium lume dials .
Hola
By: Con Nast : June 5th, 2019-04:00
I recently discovered that not only they used Radium as lume But also strontium 90 as lume on the dials. Switserland used to export strontium 90 for Medicinal use and for lume . In the late 1950 simport and use of strontium was forbidden in the USA. Actua...
Yes
By: Con Nast : June 5th, 2019-04:24
Dials for the USA market would need underlines and dot. Sometimes they where checked in the USA so you get the double underline . . Also Rolex technicians locally would relume and restore dials ( called repositioning ) they would change the contaminated l...
I know two
By: Con Nast : June 9th, 2019-01:09
The dial and lume restorer showed me a lot One of the things he showed me we all look at shape and form of lume but lume can be different per dial especially when relumed by Rolex. you have too look at the build up how the dial is colored by applied elect...
I have another one
By: Con Nast : June 9th, 2019-01:30
People have a concept of gilt being gold colored letterings, But they are white letterings from the 1960s onward. Original gilt is silver colored the Rhodium layer under the colors which shine trough the white sometimes they turn brass colored and appears...
