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Lightsped · 3 October 2016, 03:32 AM

On my Dad's Explorer II, I noticed that it has the "Swiss - T<25" text on the bottom of the dial. What exactly does that "Swiss - T<25" mean?

JohnLT · 3 October 2016, 03:35 AM

Tritium Dial

rwATR · 3 October 2016, 03:42 AM

Quote:

Originally Posted by Lightsped

On my Dad's Explorer II, I noticed that it has the "Swiss - T<25" text on the bottom of the dial. What exactly does that "Swiss - T<25" mean?

I found this online at hautehorlogerie dot org:

Quote:

"Swiss T < 25" means that the watch is Swiss and contains a certain quantity of tritium that emits less than 925 MBq (25 mCi).

*Note* I'm not sure if I'm allowed to link. If I am not allowed, please let me know.

2ar2c1 · 3 October 2016, 03:46 AM

"Swiss T<25" means that the watch contains a certain quantity of tritium that emits less than 925 MBq (25 mCi).

HogwldFLTR · 3 October 2016, 04:14 AM

Quote:

Originally Posted by 2ar2c1

"Swiss T<25" means that the watch contains a certain quantity of tritium that emits less than 925 MBq (25 mCi).

Correct; it, Tritium, is radioactive emitting safe levels hence the T<25 millicuries. Tritium is the material which caused the markers to glow while they had sufficient activity. Half life of the material is about 11 years and most Tritium dials have long since stopped glowing.

jdmi32 · 3 October 2016, 04:47 AM

Hmm. I always thought it meant super awesome, which is why I collect them.

Lightsped · 3 October 2016, 03:23 PM

So when did the Explorers quit using the Tritium?

padi56 · 3 October 2016, 04:49 PM

Quote:

Originally Posted by Lightsped

On my Dad's Explorer II, I noticed that it has the "Swiss - T<25" text on the bottom of the dial. What exactly does that "Swiss - T<25" mean?

Up till 1960 Rolex used the word SWISS on bottom of dial then dials were then Radioactive Radium from around early 1960 on Rolex used T.Swiss.T less than 277 MBq (7.5mCi) and Swiss <T25 less than925 MBq (25mCi)on there dial depending on how much radioactivity they had from 1960 till mid/late 1998.Swiss only dials were then used with Luminovor from 1998 to 2000, then after 2000 back to Swiss Made bottom of the dial with Luminover re-named to Superluminovor and now we have chromolight which is more on the blue spectrum

3 October 2016, 03:32 AM	#1
Lightsped "TRF" Member Join Date: Oct 2009 Location: Georgia Watch: Sub, OP41, DJ x 4 Posts: 845	Swiss - T < 25 ? On my Dad's Explorer II, I noticed that it has the "Swiss - T<25" text on the bottom of the dial. What exactly does that "Swiss - T<25" mean?

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3 October 2016, 03:35 AM	#2
JohnLT "TRF" Member Join Date: Oct 2015 Real Name: JohnLT Location: Boston Watch: time fly Posts: 618	Tritium Dial

3 October 2016, 03:46 AM	#4
2ar2c1 "TRF" Member Join Date: Nov 2011 Location: in a house Posts: 537	"Swiss T<25" means that the watch contains a certain quantity of tritium that emits less than 925 MBq (25 mCi).

3 October 2016, 04:47 AM	#6
jdmi32 "TRF" Member Join Date: Oct 2013 Real Name: Ky Location: Bay Area, CA Watch: 16570 Posts: 2,362	Hmm. I always thought it meant super awesome, which is why I collect them.

3 October 2016, 03:23 PM	#7
Lightsped "TRF" Member Join Date: Oct 2009 Location: Georgia Watch: Sub, OP41, DJ x 4 Posts: 845	So when did the Explorers quit using the Tritium?

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