Moritz Grossmann Atum watches

The Moritz Grossmann Atum is a 41 mm watch from Glashütte, where Christine Hutter founded the modern Grossmann in 2008 after acquiring the right to use the name of the 19th-century watchmaker. Like every Grossmann model, it is named after an Egyptian deity: Atum is the primordial god from whom all else arose, and the father of Tefnut, who gave her name to another Grossmann line.

The gold Atum is rose gold with a silver dial, or white gold with a silver or charcoal dial, 11.35 mm thick. The Enamel has a white enamel dial, and the Primavera brings champagne, burgundy and ice-blue dials. The Atum Power Reserve and Atum Date add those indications in the same 41 mm case, at 11.65 mm and 11.85 mm thick. The Matterhorn and Polo are named editions in gold.

The Atum Pure moves the watch into steel, which Grossmann says underscores the technical nature of the model family. Its finely brushed, lacquered dial has applied markers and a subsidiary seconds dial with burnished chamfers, and lancet hands with straight edges and broad chamfers; each dial colour is limited to 150 pieces. The sapphire display back shows calibre 100.1, a manually wound pillar movement in untreated German silver with a two-thirds plate, broad horizontal Glashütte ribbing and a hand-engraved balance cock carrying a micrometer screw for the Grossmann balance. It beats at 18,000 vibrations per hour and runs 42 hours when fully wound. Setting the time stops the movement; a pusher on the case flank restarts it, so the hands cannot shift as the crown goes home.

The Pure M and Pure L come in plain or DLC-coated steel, in Blue, Green, Orange and White versions limited to 50 and 25 pieces each.