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The DB2109 tourbillon runs at the seconds and must complete exactly one rotation per minute; verify with a stopwatch.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| movement | Tourbillon rotation rate | Tourbillon cage completes exactly one rotation per 60 seconds | Rotation rate deviating from 60 seconds; regulation issue requiring service |
| dial | Blued titanium dial | Blued titanium dial with depth and variation consistent with controlled oxidation | Flat uniform blue; non-genuine dial substitution |
| caseback | DB2109 serial and documentation | Matching serial number and original De Bethune certificate | Missing or non-matching documentation; requires expert authentication |