A 1760s spice chest; Frank Lloyd Wright blueprints; and a Favrile Fabrique Tiffany desk lamp.

ANTIQUES ROADSHOW host Mark L. Walberg explores 19th-century Sioux weapons with appraiser John Buxton at beautiful Sylvan Lake in Custer State Park. Notable finds include a 1760s Chester County Pennsylvania spice chest; two sets of Frank Lloyd Wright blueprints; and a Favrile Fabrique Tiffany desk lamp valued at $4,000-$6,000