Stampless cover with manuscript 'F.C. Goetz G, La Paz, Bolivia, Casilla 46, Sudamerika' return address on reverse with fine strike of 'YACO' between lines marking in black with 'T' in circle TAX marking in red and manuscript '10' alongside plus unusual circular 'P.7.' marking in violet. Addressed to GERMANY with large manuscript '40' (pfennig) postage due mark in blue crayon applied on arrival. Very scarce.