Borgel and Taubert: What’s the Difference?

My new article at WahaWatches covers an issue that the fellow vintage fans might be familiar with - cases with the famous FB and key marquee. Which of them are Borgel, and which are Taubert? 

https://wahawatches.com/borgel-and-taubert-whats-the-difference/

Enjoy!

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Interesting read.  I have been doing research that led me to Taubert via David Boettcher.