980.004/1 blank chapter ring??

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Dear all
New member. I came across this watch. Is it a 980.004/1? Didn't know they were made with a blank chapter ring? Anyone have an idea. Thanks for your knowledge.

 
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Yes, I've seen both versions. The watch was also sold as a Sinn. I'd guess that 980.004 is the blank version and yours is 980.004/1

dc