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Verify 39mm case diameter and Heuer 02 column-wheel through caseback; distinguish from larger 42mm Carrera variants.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| case | Case diameter | 39mm diameter with lug configuration specific to CBN2010.BA0642 | Case measuring 42mm; lug configuration inconsistent with 39mm spec |
| caseback | Heuer 02 column-wheel | Column-wheel architecture visible; Heuer 02 caliber designation engraved | Cam-actuated 7750 architecture; no column-wheel; incorrect caliber engraving |
| dial | Carrera dial layout | Sub-register layout correct for CBN2010 reference; date window position matches spec | Sub-register positions inconsistent with reference; incorrect date window placement |
The 39mm Carrera Chronograph (CBN2010) is the compact heir to the original 1963 Carrera. The Heuer 02 caliber inside gives it the same column-wheel column-wheel chronograph architecture as the Monaco, verifiable through the caseback. The pump pushers are flush to the case -- a defining detail of the 39mm format that distinguishes it from older Carrera generations with protruding pushers.