U.S. WWI, Artillery "Angle of site instrument Model of 1917" in leather case. Due to U.S. gov. records about 4300 of these were produced and delivered to the Western Front in 1918 ( www info )

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery

U.S. WWI,  Artillery