Autograph letter signed ("A Humboldt").
N. p., November 19, n. y.
1 p. on bifolium, approx. 130 x 200 mm. Addressed on another side in Humboldt's hand with his wax seal and post cancel-stamp.
€ 1,500.00
To "Herr Boguslawski", i. e. the meteorologist Georg von Boguslawski (1827-1884), on an appointment.
Folded for mailing, torn where unsealed, a bit marked, pencil notations by a previous owner on one blank portion, and with some denting.