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The interlocking caps which suffer, especially in the ''conical'' version, from problems of wear on the surfaces with loss of tightness, have been followed, with a trend established since the beginning of the '900, by the caps with screw closure (''threaded cap''), which are still among the most common today. A return of the interlocking caps took place in the '40s with the introduction of metal caps closed with friction on special rings (trend introduced by the [[Parker 51]]).  

The interlocking caps which suffer, especially in the ''conical'' version, from problems of wear on the surfaces with loss of tightness, have been followed, with a trend established since the beginning of the '900, by the caps with screw closure (''threaded cap''), which are still among the most common today. A return of the interlocking caps took place in the '40s with the introduction of metal caps closed with friction on special rings (trend introduced by the [[Parker 51]]).  

Towards the end of the 1940s, the first snap-action caps began to spread (one of the first companies to use them was the [[Matador]] with the [[Matador-Click]] model of 1949), which later became very common and still widely used. In this case, the quality of the mechanism is essential to ensure the long-term maintenance of the cap closure.

Towards the end of the 1940s, the first snap-action caps began to spread (one of the first companies to use them was the [[Matador]] with the [[Matador-Click]] model of 1949), which later became very common and still widely used. In this case, the quality of the mechanism is essential to ensure the long-term maintenance of the cap closure.

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