S.T. Dupont - Lighter - Gold plated

For the precise model, it is a S.T. Dupont Ligne 1 - Grand Modèle (high-end model), recognizable by its slender shape and the flame adjustment wheel located inside the cap.
Here are its exact features to include in your future listing:
Model: Ligne 1 - Grand Modèle (often called "BS" for Tall Size).
Finish: 20-micron gold plating (the hallmark under the lighter should indicate it).
Decor: Vertical and horizontal guilloché lines (often referred to as the "Horizontal Stripes" or "Checkered" decor).
Condition: Excellent working order, spark and flame functional. Sold "Full Set" with its original gray case and vintage warranty booklet."