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Authentication
The Aachen is a Flieger Type A dial with Arabic numerals and a triangle at 12; a Type B configuration with 6 and 9 only is a different Laco variant.
- Type A vs Type B dial confusion is common across the Laco line; verify the dial configuration matches the model name.
- The ETA 2824-2 is standard for this tier; verify through the caseback.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| dial | Flieger Type A dial configuration | Arabic numerals at all positions; triangle at 12; correct Type A | Only 6 and 9 Arabic numerals with batons elsewhere; Type B configuration, not Aachen |
| movement | ETA 2824-2 base | ETA 2824-2 visible through caseback | Non-ETA-2824-2 architecture; movement swap |
| caseback | Model name on caseback | Aachen model name on caseback; consistent with ref. 831991 | Incorrect model name or no model name; wrong variant |
- Crystal; sapphire standard.
- Strap; Laco OEM or appropriate leather/nylon.
Authentication guide
The Aachen 42 is Laco's DIN 8330-specification Flieger pilot watch in the city-named series. The DIN spec mandates large Arabic numerals, prominent lume, matte black anti-reflective dial, and a large crown for gloved operation. The ETA 2824-2 caseback engraves the caliber designation. Authentication is straightforward at this price point.





