I’m looking for help on the calculating function of this very rare and interesting full-calendar watch.

Van Hattum

To keep the discussion central, please comment at the Watch-Rap forum at The Purists, where I posted this as well: Please click here for the link to the original post.

Thanks for your help,


Gerard Nijenbrinks

Gerard Nijenbrinks

Gerard has been in the watch industry for over two decades now. He runs an on-line watch shop from The Hague, The Netherlands, and besides that he has journalistic and photographic activities in the field of watches. Collecting watches since he was six years old (true!) and triggered by a friend, he bought his first 'real' watch in the late eighties; an Omega Speedmaster Professional with glass back. This was the first watch of a nice, even today ever growing, collection.
Gerard Nijenbrinks

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