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4 August 2015, 01:31 AM | #1 |
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When/why was “T Swiss Made T” used?
I’ve come across a few charts over the years that reference “Swiss T-<25”, “T Swiss T”, etc. but the one that I was always curious about was the “T Swiss Made T” notation. I believe the first two listed are different based on radioactivity numbers, but not sure why the difference between “T Swiss T” and “T Swiss Made T”. It seems to have been used in the same date range so why the difference? Was it specific to country codes, models, etc.? Curious any info you guys can share.
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4 August 2015, 02:18 AM | #2 |
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4 August 2015, 02:19 AM | #3 |
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I found this on-line..
What does the "T" designation at the bottom of the dial mean? This refers to the chemical used on the hands and hour markers, which causes them to illuminate. Around 1950, watchmakers started using Tritium as their luminous material, and began indicating the amount of that radioactive material with a designation at the bottom of the dial (i.e. T SWISS T or SWISS T < 25). Around 1998, watchmakers changed the designation to read SWISS or SWISS MADE, when they replaced the Tritium with LumiNova (an organic, non-radioactive chemical), as their source of luminescence. T SWISS MADE T indicates that the radioactive material Tritium is present on the wristwatch. The amount of radioactive material emitted is limited to a maximum of 25 milliCurie. SWISS T < 25 more specifically indicates that the wristwatch emits an amount of Tritium that is less than the 25 milliCurie limit. SWISS T 25 indicates that the wristwatch emits the maximum allowable amount of Tritium (i.e. a full 25 milliCurie). SWISS (or) SWISS MADE on wristwatches produced after (around) 1998, indicates the presence of LumiNova as the luminous material. (Please Note: "SWISS" or "SWISS MADE" was also the indication on wristwatches produced prior to the 1950s, when Radium was used as the luminous material. However, at that time "SWISS" or "SWISS MADE" simply indicated that the watch was, in fact, made in Switzerland. |
4 August 2015, 02:24 AM | #4 |
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Mines fancy, I have "- T swiss T -" always been a fan of the dashes added for aesthetic.
Also part of the reason I have a hard time letting my 1500 go, as it's only marked "swiss" at the bottom. Swiss t <25 was used on sports models for the most part and T swiss T was more of a Midsize thing from what I've seen |
4 August 2015, 06:13 AM | #5 |
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Pic added (not one of mine) for reference.
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6 August 2015, 06:49 AM | #6 |
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Last year, sent my 5700 Airking Date to the Dallas RSC for a service along with having new hands and a dial replaced (paint was flaking off). The old dial was T SWISS T, the replacement dial said T SWISS MADE T. Must have had some new old stock lying around.
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6 August 2015, 07:12 AM | #7 |
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My 2.39 mil DJ has this type of dial and I believe it was installed as a replacement sometime in the early 80's or later.
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7 August 2015, 09:09 AM | #8 |
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Service dials can have the old markings but use luminova
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8 August 2015, 07:43 AM | #9 |
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Thanks Joe, knew it didn't have tritium, but thought it was cool none the less....
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8 August 2015, 01:51 PM | #10 |
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8 August 2015, 03:27 PM | #11 |
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8 August 2015, 05:21 PM | #12 | |
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Quote:
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8 August 2015, 08:13 PM | #13 |
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Good info Peter.
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5 November 2022, 03:27 AM | #14 |
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Don't think anyone answered the original question.
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5 November 2022, 10:26 PM | #15 |
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You answer is in the second reply to the OP's post.
Though I think: T SWISS MADE T was less than 7.5 milliCurie T SWISS T was less than 15 milliCurie T SWISS < 25 was less than 25 milliCurie
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