Caliber originally refers to the inner diameter of a pipe. So what is the caliber of this pipe here?
![[Quelle: © Hans Hillewaert / , via Wikimedia Commons]](https://watch-movements.eu/blog/wp-content/uploads/2016/04/512px-Alphorn_player_in_Wallis.jpg)
Calibers and Lines – What’s that?
Author: Andreas Kelz
Watch movements with Microrotors
Sorry, this post is only available in German!
Serienreife Automatik-Armbanduhren gibt es seit den 1920er-Jahren. Zunächst auf der Basis eines hin- und herschwingenden Hammers. Kurze Zeit später, 1931, entwickelt Rolex den umlaufenden Zentralrotor. Die Automatikuhr hatte sich bald durchgesetzt, barg aber einen Nachteil: der Zentralrotor benötigte zusätzliche Bauhöhe.
Watch movements? What is so interesting about it?
For several years I have been interested in watches, or more precisely in mechanical watches. And by no means only for expensive watches from the well-known luxury manufacturers. I’m particularly fond of vintage watches from manufacturers that have long since ceased to exist, new developments from small manufacturers and exotics from faraway countries like India or China. Besides the watches themselves, I am always interested in their history and the movement.
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