H. Moser x MB&F Endeavour Cylindrical Tourbillon: A Collector's Live Review

WatchProSite introduces its first LIVE review, where WatchProSite readers can voice their questions as a WatchProSite Moderator has the prototype to answer readers' questions. 

My fellow readers, welcome to the first WatchProSite LIVE review.  I'm sorry we were a little late in starting this review as I had some unexpected busy moments!  I have been very generously loaned a H Moser x MB&F Collaboration Endeavour Cylindrical Tourbillon timepiece with a stunning burgundy fumé dial.  I'll be sporting this prototype on my wrist for the next few days.  And I invite everyone to ask me their questions about the watch and I'll do my best to answer them.  I will be wearing this watch every day straight for the next few days so that way I can develop a feel for this watch, it will only be removed when I exercise, bathe, and sleep; as I'm trying to simulate "normal" use.  This will be my "only watch" for the next few days! 

This is following up on our earlier post about the H. Moser and MB&F Collaboration.  Please read this post here to learn more about the collaboration:  www.watchprosite.com /

So feel free to ask any question you like.  That's the point of the LIVE review.  It's a new format where you can ask any question you like about the watch!  I will do my best to answer all of your questions and requests!  I do have to return this watch in a few days, so please ask your question sooner rather than later! 

A lot of the questions of this watch will be related to readability and comfort since the angle of the dial is unique and the high dome is extremely unusual.  Please feel free to ask multiples of this question. 

I won't be able to test things like the power reserve, since I only have custody of this watch for a few days and I don't want to wait 72 hours just to confirm it has a full 72 hours.  I'm also not planning to go swimming with it or do anything that puts me or the watch at risk.  In this day and age of SARS-COV-19 we still have to be very careful, so I apologize if I am unable to accommodate your request or answer your question if my local laws prevent me from doing it.  I also don't own all the accuracy testing machines, so I can't give you an exact accuracy test on a Witschi machine, but I can check the time against the atomic reference time. 

This is a great opportunity for you to ask your questions about this unusual watch!  I've attached a quick blurb from H. Moser's website about the Cylindrical Tourbillon along with the stats about this watch. 

Interested in the cylindrical balance spring?  Permit me to quote Moser's website:

Invented in the 18th century, the cylindrical balance spring is reminiscent of a worm- or corkscrew, rising perpendicularly around the upper rod of the balance staff. Commonly used in historical marine chronometers at the time, it offers the advantage of developing concentrically, and therefore geometrically, since it works perfectly along the axis of its pivots. This gives it a significant advantage over the flat balance spring, whose opposite ends tend to exert forces on the pivots, despite the Philips or Breguet terminal curves which were specifically developed to partially correct the non-concentric opening of the balance spring. Fitted with a Breguet overcoil at both attachment points, the cylindrical balance spring reduces pivot friction and greatly improves isochronism. Due to its specific shape, the cylindrical balance spring is far more difficult to produce and takes ten times longer to make than a traditional balance spring.

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