Quadrum

The Quadrum capsules are square-shaped numismatic protection cases designed for the storage and display of coins, medals, and other flat collectibles. They are manufactured by Leuchtturm, a German company specializing in collecting supplies for several decades.

Each Quadrum capsule consists of two interlocking parts: a transparent base and lid made from high-clarity acrylic plastic, allowing optimal viewing of both sides of the coin without direct handling. The inner black foam gasket secures the coin and enhances its relief and details.

The Quadrum capsules are available in several inner diameters, expressed in millimeters, to accommodate a wide range of coins from around the world, from small strikes to large coins such as gold and silver bullion coins. The outer dimensions of all Quadrum capsules remain identical ? 50 x 50 mm ? making them compatible with Quadrum inserts and binders specifically designed for this format.

This standardization of outer dimensions facilitates the uniform filing of collections composed of coins of different sizes. The capsules can be inserted into dedicated Quadrum trays or binder sheets, offering a modular and coherent storage system.

The materials used in the manufacture of Quadrum capsules are PVC-free and free from plasticizers that could migrate onto the surface of coins, making them a suitable solution for the long-term preservation of coins in precious metals as well as common metals. The hermetic design also limits exposure to atmospheric agents that can cause oxidation or tarnishing.

The Quadrum capsules are suitable for both private collectors and numismatic trade professionals wishing to present their coins in a rigorous and uniform manner. They are sold individually or in boxes of multiple units depending on the selected inner diameter.