How do know if your st Dupont lighter from the 1970's laque de chine a ligne 1 or 2?

To determine if your 1970s S.T. Dupont Laque de Chine lighter is a Ligne 1 or Ligne 2, check the dimensions and design features. Ligne 1 lighters are typically smaller and more compact, while Ligne 2 lighters are larger and have a more elongated shape. Additionally, Ligne 2 models often feature a distinctive, adjustable flame and a more intricate design. You can also look for any markings or stamps on the bottom that indicate the model.