1862 SG72 x 2 1/- green (1x defective) and SG76 3d small letters cover to Mexico

1862 cover to Mexico bearing two 1855 1/- green (one defective) plus 1862 3d to form the 2/3d rate tied 159 of Glasgow via London then onwards to Mazatlan.2 and 0 applied for internal rates on arrival. A fine cover with Scottish mail to Mexico seldom seen