1988 "1 Lev" Circulation Coin Series: Circulation Coins Metal: CuNi alloy Coin Weight: 4.80 grams (0.15 ounces) Mintage: Unknown 1988 "50 Stotinki" Circulation Coin Series: Circulation Coins Metal: CuNi alloy Coin Weight: 4.00 grams (0.13 ounces) Mintage: Unknown 1988 "20 Stotinki" Circulation Coin Series: Circulation Coins Metal: CuNi alloy Coin Weight: 3.00 grams (0.1 ounces) Mintage: Unknown 1988 "10 Stotinki" Circulation Coin Series: Circulation Coins Metal: CuNi alloy Coin Weight: 1.60 grams (0.05 ounces) Mintage: Unknown 1988 "5 Stotinki" Circulation Coin Series: Circulation Coins Metal: Bronze alloy Coin Weight: 3.00 grams (0.1 ounces) Mintage: Unknown 1988 "2 Stotinki" Circulation Coin Series: Circulation Coins Metal: Bronze alloy Coin Weight: 2.00 grams (0.06 ounces) Mintage: Unknown 1988 "1 Stotinka" Circulation Coin Series: Circulation Coins Metal: Bronze alloy Coin Weight: 1.00 grams (0.03 ounces) Mintage: Unknown 1988 "Second Soviet-Bulgarian Space Flight", 20 Leva .500 Silver Coin Series: Space Exploration Metal: Silver 500/1000 Coin Weight: 11.20 grams (0.36 ounces) Silver content: 5.6 grams (0.18 ounces) Mintage: 100,000 1988 "Second Soviet-Bulgarian Space Flight" Coin Series: Circulation Coins Metal: CuNi alloy Coin Weight: 11.00 grams (0.35 ounces) Mintage: 300,000 1988 "24th Summer Olympic Games, Seoul (Republic of Korea), 1988", 10 Leva .640 Silver Coin Series: Summer Olympic Games Metal: Silver 640/1000 Coin Weight: 18.75 grams (0.6 ounces) Silver content: 12 grams (0.39 ounces) Mintage: 30,000 1988 "24th Summer Olympic Games, Seoul (Republic of Korea), 1988" Coin Series: Summer Olympic Games Metal: CuNi alloy Coin Weight: 11.00 grams (0.35 ounces) Mintage: 300,000 1988 "24th Summer Olympic Games, Seoul (Republic of Korea), 1988" Coin Series: Summer Olympic Games Metal: CuNi alloy Coin Weight: 7.00 grams (0.23 ounces) Mintage: 300,000 1988 "100 Years Bulgarian State Railways", 20 Leva .500 Silver Coin Series: Historic Aniversaries Metal: Silver 500/1000 Coin Weight: 11.20 grams (0.36 ounces) Silver content: 5.6 grams (0.18 ounces) Mintage: 100,000 1988 "100 Years Kliment Ochridski University of Sofia" Coin Series: Historic Aniversaries Metal: CuNi alloy Coin Weight: 11.00 grams (0.35 ounces) Mintage: 300,000 1988 "25 Years Kremikovtzi Metal" Coin Series: Historic Aniversaries Metal: CuNi alloy Coin Weight: 16.40 grams (0.53 ounces) Mintage: 200,000 1988 "300 Years Since the Chiprovtzi Uprising" Coin Series: Historic Aniversaries Metal: CuNi alloy Coin Weight: 16.40 grams (0.53 ounces) Mintage: 100,000 1988 "120 Years Since the Death of Hadji Dimitar and Stefan Karadja" Coin Series: Historic Aniversaries Metal: CuNi alloy Coin Weight: 16.40 grams (0.53 ounces) Mintage: 100,000 1988 "24th Summer Olympic Games Seoul (Republic of Korea), 1988", 25 leva .925 Silver Coin Series: Summer Olympic Games Metal: Silver 925/1000 Coin Weight: 23.33 grams (0.75 ounces) Silver content: 21.58 grams (0.69 ounces) Mintage: 30,000 1988 "110 Years Since the Liberation of Bulgaria from Ottoman Rule", 20 Leva .500 Silver Coin Series: Historic Aniversaries Metal: Silver 500/1000 Coin Weight: 11.20 grams (0.36 ounces) Silver content: 5.6 grams (0.18 ounces) Mintage: 100,000 1988 "Forth International Children's Assembly, Sofia (Bulgaria), 1988" Coin Series: International Children's Assembly Metal: CuNi alloy Coin Weight: 16.40 grams (0.53 ounces) Mintage: 100,000 1988 "100 Years Kliment Ochridski University of Sofia", 20 Leva .500 Silver Coin Series: Metal: Silver 500/1000 Coin Weight: 11.20 grams (0.36 ounces) Silver content: 5.6 grams (0.18 ounces) Mintage: 100,000