Bidspirit auction | United States
United States - 1989, 20th UPU Congress, Historical Mail Delivery, (25c) multicolored, top sheet margin inscribed se-tenant block of four, dark blue color omitted, full OG, NH, F/VF, C.v. $300 , Sc. #2437b
United States - 1989, 20th UPU Congress, Historical Mail Delivery, (25c) multicolored, top sheet margin inscribed se-tenant block of four, dark blue color omitted, full OG, NH, F/VF, C.v. $300 , Sc. #2437b