Tissot 6215-5 CH27 (Omega 321) Chronograph with some questions

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Hey guys,

last week I found this Tissot Ref. 6215 Chrono with some questions. The watch itself is stunning: loveley dial, perfect condition case and of course, the movement. A calibre CH27-12, the predecessor to the Omega 321.

What puzzles me are three things.

I. I havnt found a second dial of this variant. Wether in this reference nor in the 6216 watertight case. Does someone have seen a similar dial to mine? I asked @Vitezi if he thinks the dial looks legit, and he has no doubt. This was something I was afraid of. Thanks for the help again 😀

II. The number on the movement is just a 51. Usally I would expect a serial number that is longer. There is also no other place with a serial. The caseback just says 6215-5. Any Idea what the 51 could hint to?

III. Last thing is the number on the case. I can see a 4, but what is the other ones? Looks like a possible star, but no number.

Thanks guys, now enjoy the pics of this gem.

Nico

 
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SN under the dial, ends in 51 to match the escape wheel bridge?