This is a Delta Scrigno– Italian for “treasure chest”
Scrigno is an innovative collection of writing instruments offering a tiny coffer inside the cap which is capable of safeguarding one’s most intimate secrets. Simply unscrew (counterclockwise) the top of the cap to uncover the inner container made of food safe steel. Use of this space is left to your imagination.
The Scrigno collection is made from special resins turned by hand, and offered in various colors. It is available as fountain pen with cartridge and converter, and also as a rollerball. The trimmings are rhodium plated.
Have you ever seen/tried one of these? Is it on your wish list?