10c on 20c blue on bluish paper 'Registration' issue of Colombia, issued at Panama, a fine used copy with handstruck '8152' registration number in blue. Small thin but scarce stamp. (SG R68)
10c on 20c blue on bluish paper 'Registration' issue of Colombia, issued at Panama, a fine used copy with handstruck '8152' registration number in blue. Small thin but scarce stamp. (SG R68)