Guinea-Bissau-Chess-Champions GUINEA-BISSAU - CHESS CHAMPIONS Mint Sheet of 6 GB8503a GUINEA-BISSAU - CHESS CHAMPIONS Souvenir Sheet GB8503b GUINEA-BISSAU - CHESS CHAMPIONS On Stamps MNH GB6202a GUINEA-BISSAU - CHESS CHAMPIONS Souvenir Sheet GB6203b GUINEA-BISSAU - CHESS CHAMPIONS On Stamps GB6203a GUINEA-BISSAU - CHESS CHAMPIONS On Stamps GB6204a GUINEA-BISSAU - CHESS CHAMPIONS Souvenir Sheet GB6202b GUINEA-BISSAU - CHESS CHAMPIONS Souvenir Sheet GB6204b GUINEA-BISSAU - CHESS CHAMPIONS 4 Stamp Sheet - GB8114a GUINEA-BISSAU - CHESS CHAMPIONS 4 Stamp Sheet - GB8113a GUINEA-BISSAU - CHESS CHAMPIONS 4 Stamp Sheet - GB8112a GUINEA-BISSAU - CHESS CHAMPIONS 4 Stamp Sheet - GB8115a