Why you should keep the certificate and original packaging of BNB coins

When you buy a commemorative coin at the BNB’s counters, you get more than a coin: it is in a transparent capsule, placed in a box, together with a certificate of authenticity. Many people keep only the coin and throw the box away. It is one of the most expensive mistakes a collector can make.

What the set contains

• The capsule – rigid transparent plastic that protects the proof surface from fingers, dust and scratches.
• The box – with the BNB logo. It keeps the capsule and the certificate together.
• The certificate – a document issued by the BNB with the technical data of the coin: face value, metal and fineness, weight, diameter, quality and mintage.

Why the set has value

1. Proof of origin. The buyer sees that the coin comes from the official issue and has probably not been handled. With modern coins, which are almost always sold in their original form, a missing set raises questions.
2. The market standard. Dealers and collectors describe modern coins as “complete set – capsule, box, certificate”. A coin without them is sold as “coin only” and usually cheaper. With mass-produced silver coins the difference is noticeable, and with gold and rare issues it can be significant.
3. Protection of the proof surface. Proof coins are extremely sensitive. A coin taken out of its capsule almost inevitably picks up fingerprints and micro-scratches that lower its grade.
4. Easier resale. A complete set sells faster and with less haggling.

The certificate is not a guarantee for the coin in your hand

The BNB certificate describes the issue, not the specific coin in your hand – it is not “attached” to the capsule. This means that on the secondary market:

• certificate and box can be separated from the original coin;
• fake packaging and certificates are also found, used to “legitimise” copies.

So when buying from an unknown seller, check that the data in the certificate match the coin and the description in our catalogue. Check the coin itself too – weight, diameter, details. More: Simple tests at home.

How to store the set

• Do not open the capsule. If you must, hold the coin only by the edge, with gloves.
• Keep the box in a dry place. Cardboard and fabric absorb moisture, which reaches the coin as well. See the ideal conditions for a collection.
• The certificate – flat and dry. Do not fold it, do not write on it and do not keep it in direct light.
• Number them. If you have many coins, put a small label on the box (not on the certificate), so that you do not mix up the certificates.
• Keep the receipt too. It shows when and where the coin was bought and can be useful for insurance or a sale.

If you have already thrown the box away

The coin is not lost – it keeps its metal and collector value. Put it in a suitable capsule of the exact diameter (38.61 mm for most silver 10 leva coins) and store it properly. When selling, state honestly that it is “without box and certificate”.

The full list of BNB coins, with mintages and issue prices, is in the catalogue. How new issues are bought is described in the article How to buy commemorative coins from the BNB.