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Mass-produced#1 in familyOfficial press photos

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Medium-large: suits wrists 6.5 in+ (16.5 cm+)
42 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.

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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.

Known issues in the market
  • 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.
AreaWhat to checkWhat is correctRed flag
dialFlieger Type A dial configurationArabic numerals at all positions; triangle at 12; correct Type AOnly 6 and 9 Arabic numerals with batons elsewhere; Type B configuration, not Aachen
movementETA 2824-2 baseETA 2824-2 visible through casebackNon-ETA-2824-2 architecture; movement swap
casebackModel name on casebackAachen model name on caseback; consistent with ref. 831991Incorrect model name or no model name; wrong variant
Common legitimate replacements
  • Crystal; sapphire standard.
  • Strap; Laco OEM or appropriate leather/nylon.
Expert resources: Laco authorized service; German pilot watch collector forums.

Authentication guide

Last reviewed June 2026

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.

Known reproduction risks

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LOW

Not a reproduction target at this price. Non-compliant dials (glossy rather than matte) are the most common quality issue on informal-market examples.

  • Glossy dial when DIN 8330 requires matte anti-reflective
  • Arabic numerals with non-standard font for the DIN spec
  • Caseback without ETA designation

Dial variants by era

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EraDescriptionIdentifiers
2019 to presentMatte black anti-reflective dial with large white Arabic numerals. No bezel markings. Strong lume on all indices and hands. Large crown at 3. Date at 3.
  • "LACO" at 12, "PFORZHEIM" or city identification below
  • Large Arabic numerals, no other embellishment
  • Matte anti-reflective finish on dial (no gloss)
  • Large unguarded crown at 3
  • Date window at 3
  • "MADE IN GERMANY" or German manufacture identification

Service part flags

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Dial anti-reflective finish

Original: DIN 8330 requires a matte anti-reflective dial to reduce cockpit glare. The dial surface should absorb rather than reflect light at any angle.

Replacement tells
  • Glossy or semi-gloss dial finish (non-DIN replacement dial)
  • Reflective surface visible at oblique angles
Movement (ETA 2824-2)

Original: ETA 2824-2 automatic. Caseback engraves the caliber designation. The caseback is solid steel (no exhibition).

Replacement tells
  • Caseback without caliber engraving
  • Exhibition caseback when the standard Aachen uses solid steel

Case back markings

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2019 to present
  • Reference 831991
  • "LACO" and Pforzheim identification
  • ETA 2824-2 caliber engraved on solid caseback
  • 100M water resistance
  • Serial number

Movement tells

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  • ETA 2824-2 power reserve is 38 to 42 hours. Standard indicators apply.
  • Large crown should wind smoothly without excessive play at the stem.
Sources: Laco Aachen 42 official product documentation; DIN 8330 Flieger watch specification.

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