Guatemala 1937 1c olive (GPO Building) opt'd 'Exposicion Filatelica 1937' unmounted mint SG 324
Guatemala 1937 1c olive (GPO Building) opt'd 'Exposicion Filatelica 1937' unmounted mint SG 324
Guatemala 1937 1c olive (GPO Building) opt'd 'Exposicion Filatelica 1937' unmounted mint SG 324