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The Erwin single-pusher chronograph must start, stop, and reset in three-phase sequence from one pusher; any Erwin with two pushers has been incorrectly described.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| case | Single crown-integrated pusher | One pusher only; crown-integrated; three-phase sequence start/stop/reset | Two pushers present; incorrect description or non-genuine configuration |
| movement | Cal. A11MS in-house monopusher chronograph | In-house monopusher mechanism visible through caseback | Column-wheel two-pusher mechanism; non-genuine movement |
| dial | Habring2 dial printing | Habring2 dial text consistent with Erwin production; correct register layout | Incorrect dial text or register layout inconsistent with Erwin specification |
The Erwin is a bicompax single-button monopusher chronograph from Habring², a micro-manufacture run by Richard and Maria Habring in Austria. The A11MS caliber is based on a modified Valjoux 7760, with a column wheel replacing the original cam mechanism. This modification is visible through the sapphire caseback and is the primary mechanical authentication point.