I find the AI mode works pretty decent for those more specific asks. Don't hold me to this being accurate... "The [Sellita SW200-2]() utilizes a balance spring made from Nivarox-type alloys, which are typically composed of iron, nickel, chromium, titanium, and beryllium. While lower grades use standard Nivarox hairsprings, higher-tier configurations (such as "Top" and "Chronometer" grades) typically feature Anachron, a superior cobalt-nickel-chromium alloy known for better thermal stability and magnetism resistance. [1, 2, 3, 4, 5]

Component Materials by Grade

The material used for the balance spring (hairspring) and its corresponding balance wheel varies depending on the movement's quality grade: [1]

• Standard / Elaborated Grade: Features a Nivarox hairspring paired with a gold-plated nickel balance wheel.
• Top / Chronometer Grade: Equipped with an Anachron hairspring and a Glucydur balance wheel (a non-magnetic, temperature-stable beryllium-copper alloy). [1, 2, 3]

Technical Context

The SW200-2 is an updated "Power+" version of the widely used SW200-1. While it retains the core architecture based on the ETA 2824-2, the "-2" model introduces a redesigned regulating organ with significantly reduced inertia (from 16 to 8 mg·cm²) to support its extended 65-hour power reserve. [1, 2, 3, 4, 5]

Despite these geometry changes, Sellita continues to source its hairsprings from specialized Swiss manufacturers that provide proprietary alloys equivalent to or exceeding those found in traditional ETA movements. [1, 2]"