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Authentication
The Series 4 uses an English lever escapement rather than co-axial; the English lever architecture through the caseback is the correct escapement for this earlier RWS platform.
- The English lever is a precision-adjusted modification of the traditional Swiss lever; it is correct for Series 4 and should not be flagged as non-genuine.
- Series 4 is the earliest RWS platform; verify the escapement type matches the correct series before purchase.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| movement | English lever escapement architecture | English lever escapement visible through caseback; correct for Series 4 | Co-axial wheel present; would indicate a Series 1/2/3 movement in a Series 4 case |
| movement | In-house hand-wound architecture | Hand-wound movement with no rotor | Automatic rotor present; wrong movement for Series 4 |
| caseback | Roger W. Smith serial and Series 4 designation | Serial and Series 4 designation correctly engraved | Missing or incorrect engravings; non-genuine caseback |
| movement | Smith-level movement finishing | Hand-done finishing consistent with RWS workshop standards under a loupe | Machine-regular finishing; non-genuine movement |
- No serviceable parts outside RWS workshop.
Authentication guide
The Series 4 is Roger Smith's cushion-case reference: a 38mm cushion-shaped case in steel or white gold with a co-axial-inspired English lever escapement and small seconds. Architecturally distinct from the round Series; provenance from the workshop is mandatory.





