MeisterSinger Watch No. 03 DM901. MeisterSinger watches gathers the momentum of daily life and calmly feeds it back to the small 40mm playing field that features one single hand. No.03 40 mm is not only 3mm smaller in diameter, it is also more than 1mm flatter than the larger No.03. That may not sound like a lot, but makes a big difference when worn on the wrist, turning the 40mm version into a completely different watch, more discreet, more elegant, and ideal for everyday use.