Great Britain. (Finland). 1857. Stamp-less unpaid envelope addressed to Christinestad, Finland cancelled by London/ Crown, endorsed 'via Ostende & St. Petersburg' with '4' and '3' in blue ink, Prussian claims for Belgian and Prussian transit (4 silbergroshen) and forwarding charge to Russia (3 silbergroschen) with 'Aus England Per Aachen/ B' in red on reverse and rated '33' (33 silver kopecks) in mauve ink payable on delivery in Finland. The 1852 rate for letters to Finalnd via Belgium was 11 1/2d per 1/2 oz. Very fine.