"Castle of Chapultepec, City of Mexico" (#110) and "Vessels in Lock, Grand Canal, Holland" (#109).

Published by Truman Ward Ingersoll (1862-1922). He started releasing these sort of half-tone lithoviews in 1900. It's likely printed from an original Ingersoll negative, but he did buy some negatives from other photographers.

Standard-size stereograph, measuring about 3.5" x 7".

Will be shipped safely & securely!