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The craftsman's initials are engraved behind the roller.The sophistication of the "cling", the famous crystal clear sound made when the cap of certain lighters is opened each lighter is tested by the discerning ear of a demanding craftsman appointed to perform this task.The quest for perfection is evident in the attention paid to details, with the goal of making each lighter unique The pyrophoric lighting system is the most reliable on the market - the spark is produced when the roller rubs against a flint.The production of a single lighter requires no less than 70 components, 600 operations and 300 quality control tests.You should need to screw in the butane canister refill, and we (as well as ST Dupont) recommend to only use Dupont Butane gas in ALL ST Dupont Lighters. If it comes with a brass butane adapter (unless it screws in) its probably Counterfeit. Dupont Lighters are very technical products ensuring maximum reliability. All Line 2 Lighters have a yellow paint dot underneath the cap of the refill valve representing to use the gold Dupont Butane refill can (see picture below).
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Sound perfection: sophistication of the unique crystalline sound on the opening, the cling that has made this lighter a world-famous original accessory. Aesthetic perfection: majestic proportions respecting the golden number, an artistic and architectural reference.