GrailAtlasAn independent reference for mechanical watches

Watches with unclassified calibers

References in the Grail Atlas catalog at this movement tier — the prestige and serviceability signal carried by the caliber.

Movements listed as "unknown" or undisclosed are typically Chinese-made calibers (Hangzhou, Seagull, Shanghai Watch) used in unbranded or microbrand pieces. The Seagull ST19 is the most-cited example — a chronograph movement originally derived from the Venus 175 (1948) that powers many sub-$500 chronographs. Quality varies; service support outside China is limited; transparency from the seller about caliber source is the most important signal.

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194 references in this movement tier

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Watches with unclassified calibers — Grail Atlas