Sinn Novelties 2017 pt 2: The EZM 12

Sinn needs no introduction here on worn&wound – we have featured a number of their watches over the years, and they always seem to hit right in the sweet spot of good design, excellent performance, and solid value, all of which makes Sinn a favorite brand among w&w writers and readers alike. Sinn’s Baselworld 2017 lineup is no exception – we covered a few of the highlights yesterday, and now we’ll take a look at what might be the star of bunch: the EZM 12.

Mission Timer: Mission Ready

Sinn’s EZM line (EZM is short for Einsatzzeitmesser, roughly translated “mission timer”) marks its 20th anniversary this year with a new watch that fits nicely into the mission timer series. The EZM 12 was designed specifically for use by rescue helicopter doctors, and although that seems like an overly-specific group to target, the features designed for that mission make this an interesting and useful watch in any time-critical task. The three major feature areas this watch provides the wearer are: efficient and legible count-down and count-up timers; quick patient pulse monitoring; and a robust, legible, and easily cleaned case.


In the medical rescue community, there are two time-related concepts that guide the actions of the professionals at work, and Sinn has incorporated both in to the EXM 12: the golden hour and the platinum ten minutes. The golden hour is the first hour after injury in which care and treatment are most critical. Receiving good medical treatment within the first hour following serious injury can often mean the difference between life and death, especially when blood loss is occurring. The platinum ten minutes are the first moments after an emergency crew arrives at the scene of trauma, surveys the situation, decides what care is required, and begins treatment.

The EZM 12 allows its wearer to keep track of both periods of time using an internal rotating bezel. The first ten marked minutes on the bezel – the platinum ten – are indicated with orange paint, while the rest of the hour is indicated by white paint over an increasingly thick orange band. This count-up timing bezel is set by turning the crown at 2:00 until the 0 mark of the bezel aligns with the current location of the minute hand. As the minute hand continues to move, the elapsed time since setting can be read on the adjacent bezel.

In the hands of a professional

A second rotating bezel – this one on the outside of the watch – works the other direction, counting down the minutes remaining from the position the bezel it set until the minute hand reaches the big triangle at the bezel’s 0 position. Together, these two bezels allow the wearer to keep track of elapsed or remaining time in a specific task.

The PulsRotor’s hands are shaped like a helicopters blades

The second medical rescue feature of the EZM 12 is probably it’s most visibly unique: the PulsRotor. If you’re familiar with a pulsometer or ‘pulsations dial’ watch, you’ll understand the concept here. The doctor finds the patient’s pulse, starts counting heartbeats when the seconds hand is at 0, and reads the number next to the hand when the heartbeat count reaches 15 beats. The number read is the patient’s bpm, or heartbeats per minute. In most pulsometers, the wearer either activates the second hand by pressing a button or has to wait the remainder of the minute for a running second hand to reach 0.

On the EZM 12, neither of these issues occur, due to a clever and attractive solution called the PulsRotor. Rather than a single center seconds hand, the seconds hand is actually four hands radiating from a center spoke, fashioned to look like the rotor blades of a helicopter. While the hands rotate, the wearer only has to wait a maximum of 15 seconds for the next advancing hand to reach the 0 mark when pulse readings can begin. It’s a clever solution to the pulsometer problem and adds to the watch’s rescue constantly around the dial.

Removable bezel for easy cleaning
Hook on straps for tool-free removal

Like all Sinn EZM watches, the EZM 12 is a beast of a watch. The antimagnetic, tegimented steel case is large – 44mm wide, longer lug to lug – and quite heavy; the head alone weighs in at 122 grams (for comparison, a Seiko SKX007 with a jubilee bracelet is about 140 grams). Sinn lightens the overall weight by supplying the watch a rubber strap, but it’s no ordinary strap. Since medical professionals place cleanliness near the top of their list of workplace requirements, Sinn created a clever quick-release hook system for the strap to allow easy removal and cleaning. With the watch off your wrist, you bend the strap down towards the caseback then push the strap outward away from the case, and the end of the strap pops out of the gap between the case and bar. In a similarly easy maneuver, the outer bezel pops off with some levering of the large flat screwdriver on the supplied multitool. Despite its large size the watch wears comfortably and will certainly attract a fair amount of attention.

WatchBuys is currently accepting reservations for the EZM 12 at a price of $3340.

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Brandon was raised in a military family, the son of an Army pilot and engineer. An early fascination with all things mechanical developed into a love of watches that remains today. Brandon holds a pair of degrees in experimental psychology and works as a human factors test engineer for Army aviation systems.