Borders of Sheet, Control Number at Back. The item "Spain 1931 Full Set Air Montserrat Block x4 Borders of Sheet Ed. 650/4 MNH Luxe" is in sale since Sunday, December 2, 2018.This item is in the category "Stamps\Europe\Spain & Colonies". The seller is "futurecyborg" and is located in Madrid. This item can be shipped worldwide.