IWC chose their in-house-made caliber 98300 which operates at 2.5Hz (18,000bph) and has a power reserve of just 46 hours, being manually wound. The idea here is likely that IWC wanted to convey the most pure sense of “old-time winding” since on most accounts the caliber 98300 (despite its contemporary construction) is based on rather old horological architecture http://www.d4l.co/iwc-replica.html.
Circus size and controversial inspirations are probably a good thing when you want to sex up a wearable desk clock. On that note, the IWC Big Pilot’s Heritage Watch 55 would make an excellent desk (or dashboard) clock. Unfortunately, despite the large case size, it doesn’t have a long power reserve.
The biggest let down in a timepiece such as this that IWC didn’t make better use of the space inside. With all that case real estate, they could have easily included some movement with a power reserve of at least week or more. I mean, the standard IWC Big Pilot’s watch is both an automatic and has a power reserve of about a week. Instead, IWC preferred to go an alternative route and get a bit more vintage chic with the mechanism inside of this reference 5104 timepiece.
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