What is a proof stamp?
A mirror stamp—known internationally as Proof (English) or PP—Polierte Platte (German)—is a method of preparing stamps and discs and a special minting process that gives...
The most popular bullion coins — gold and silver
Bullion coins – both gold and silver – have been attracting the attention of investors and collectors around the world for years. They combine the value of precious metals with timeless design and...
Cataloging coins—how to do it effectively and safely?
Cataloguing coins is more than just organizing a collection—it's a way to tell the story written in metal. A well-organized collection not only allows you to enjoy...
The rarity of coins and its impact on price
Rarity is one of the key factors determining the value of coins. It is what causes some coins to fetch staggering prices at auctions, while others remain...
The NBP issue plan – how to read it and use it to plan purchases?
The NBP's issuance plan is not just a list of upcoming coins. It is a compass for collectors and investors: it allows them to see in advance the themes of the issues, their parameters,...
