1959 Great Britain Wilding ½d Phosphor-Graphite Corner Cylinder Pair
- Catalog Reference: Stanley Gibbons Specialised S8a / S8
- Cylinder / Box Marking: Cylinder 3 (No Dot) — Box Number 34001
- Specialist Variety: Narrow Phosphor Band at Left
- Format: Horizontal Marginal Pair from the Top-Left Corner of the Sheet
- Condition: Mint, exceptionally lightly hinged on the selvedge (margin) only. The stamps themselves remain pristine and unmounted.
Key Features & Diagnostic Marks:
- Autotron Registration Mark: Features the highly collectible printer’s semi-circle alignment clip out of the top edge of the selvedge, sitting perfectly above the 34001 box number.
- Phosphor Shift: The characteristic yellowish phosphor band overprint has shifted left, running tightly along the vertical perforation track to confirm the "Narrow Band at Left" classification.
- Graphite Alignment: Features the original vertical dark conductive graphite lines fully intact on the reverse side of both stamps.
- Provenance: Beautifully presented on a specialist dealer card from the highly respected Tony Bellew Ltd, complete with full technical details and certification of the variety.