Muehle Glashuette Watch 29er M1-25-23-MB. As a yawl, the 29er is a one design boat. That means that all boats have more or less the same design, from the sail to the hull. The same applies to the 29er wristwatches. Despite different case diameters, the 29er and the 29er Big resemble each other like identical twins. And not only as far as their design is concerned but also in terms of precision.