Round capsules

Round coin capsules are the most widely used protective packaging in numismatic conservation. Made from rigid plastic, usually transparent acrylic or polystyrene, they consist of two snap-together parts that hold the coin without direct finger contact, thereby preserving the shine and surface condition of the coins.

These circular numismatic capsules are available in a wide range of internal diameters, expressed in millimetres, in order to precisely match the dimensions of each coin. The most common diameters cover both small gold coins such as the 10 franc Napoléon or the British Sovereign, and large silver coins such as the 10 euro Marianne, the American dollar or the commemorative 2 euro coin.

Choosing the right diameter is essential: a capsule that is too large allows the coin to move inside and risks causing scratches on the edge, while a capsule that is too small can exert damaging pressure on the reliefs. Some models incorporate a soft O-ring that ensures optimal retention and an airtight seal that limits exchanges with ambient humidity.

Transparent round capsules allow both sides of the coin to be viewed without handling, making them an indispensable tool for display, storage and sale presentation. They are compatible with many numismatic storage systems: slotted trays, collection boxes, wall frames and specialised albums.

The main brands on the market, such as Leuchtturm, Lindner, Schuler and Intercept, offer comprehensive ranges covering international standards. Some references use anti-UV materials or antistatic treatments for enhanced protection, particularly suited to FDC (Fleur de Coin) or Proof quality coins.

These supplies are used by private collectors, numismatic dealers, auction houses and museum institutions to guarantee the long-term integrity of coins. The round capsule remains the reference solution for individual coin conservation, combining practicality, accessibility and protection efficiency.