The Czech National Bank issues 200 / 500 Koruna (Kč) silver commemorative coins and golden commemorative coins of various denominations. The golden coins are issued in thematic sets – Bohemian crown set, Charles IV set, Ten centuries of architecture set, Industrial Heritage Sites set and Bridges in the Czech Republic set. In 1999 the special 2000 Kč silver coin with golden inlay and hologram was issued. In 2019, to commemorate the 100th anniversary of Czechoslovak koruna, a heavyweight gold coin weighing 130 kg was issued as well as a commemorative one-hundred crown banknote. Specifications Silver 200 Kc face value coins. (Issued from 1993 to 2010) diameter: 31 mm, thickness: about 2.3 mm, weight: 13 g purity: 900/1000 Ag 100/1000 Cu border proof : imprint "ČESKÁ NÁRODNÍ BANKA * Ag 0.900 * 13 g *" Silver 200 Kc face value coins. (Issued from 2011) diameter: 31 mm, thickness: about 2.3 mm, weight: 13 g purity: 925/1000 Ag 75/1000 Cu border proof : imprint "ČESKÁ NÁRODNÍ BANKA * Ag 0.925 * 13 g *" Silver 500 Kc face value coins. (Issued from 2011) diameter: 40 mm, thickness: about 2.6 mm, weight: 25 g purity: 925/1000 Ag 75/1000 Cu border proof : imprint "ČESKÁ NÁRODNÍ BANKA * Ag 0.925 * 25 g *" Gold 1 000 Kc face value diameter: 16 mm, weight: 3,111 g purity: 999,9/1000 Au Gold 2 000 Kc face value, Ten centuries of architecture diameter: 20 mm, weight: 6,22 g purity: 999,9/1000 Au Gold 2 500 Kc face value, Industrial Heritage Sites diameter: 22 mm, weight: 7,777 g, thickness: 1,45 mm purity: 999,9/1000 Au Gold 5 000 Kc face value diameter: 28 mm, weight: 15,55 g purity: 999,9/1000 Au Gold 10 000 Kc face value diameter: 34 mm, weight: 31,107 g purity: 999,9/1000 Au Most are made in PROOF and BU versions. The Czech gold commemorative coin sets All proof coins have got plain edge and all BU have got milled edge. Castles in the Czech Republic Ten gold coins issued from 2016 to 2020. All have the face value of 5 000 Kč. Bridges in the Czech Republic Issued from 2011 from to 2015. All have got face value 5 000 Kc. Industrial Heritage Sites Issued from 2006 to 2010. All have got face value 2 500 Kc. Ten centuries of architecture Issued from 2001 to 2005. All have got face value 2 000 Kc. Note: BČM =