Block of 4 poster stamps, advertising, with 4 different views of ELECTRICAL SUPPLIES store, signage for MAZDA Lamps, Cahn-Forster Electric Co., Denver, Colorado, ca1900-1910s.The poster stamps are intact as a block of 4 (slight split right horizontal at perforation); clean gummed backs; very light wear along edges. Block measures 5 3/4" x 4 1/4". Domestic buyer pays $4.13 S&H.