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In-house manufacture caliber
Medium-large: suits wrists 6.5 in+ (16.5 cm+)
41 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.
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Authentication
The Benu Pure three-quarter plate chamfers must be hand-polished; machine-finished chamfers do not meet the Moritz Grossmann stated standard.
Known issues in the market
- The Grossmann regulator spring is visible under magnification; it is a house signature distinct from a standard index regulator.
- The three-quarter plate is the Glashütte finishing reference.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| movement | Three-quarter plate hand-polished chamfers | Sharp hand-polished chamfers on three-quarter plate bridges; consistent with Grossmann standard | Machine-finished chamfers; does not meet Moritz Grossmann stated standard |
| movement | Grossmann regulator spring | Grossmann regulator spring visible under magnification; distinct from standard index regulator | Standard index regulator replacing Grossmann regulator spring; non-genuine movement |
| caseback | Cal. 100.1 architecture | Cal. 100.1 three-quarter plate visible through caseback; manual-wind | Non-Cal-100.1 architecture; movement swap |
Common legitimate replacements
- Crown; Grossmann-signed only.
- Crystal; sapphire standard.
Expert resources: Moritz Grossmann authorized service; Glashütte regional watchmaker network.
Authentication guide
Last reviewed June 2026
The Benu Pure shares the Cal. 100.1 architecture with the Atum but uses a different case geometry and dial layout. Both watches share the Grossmann eccentric-screw balance wheel as the primary authentication anchor. The Benu is slimmer at 10mm height.
Sources: Moritz Grossmann Benu technical documentation.





