ORIGINAL 1964 THE FRONTIER CONSTABULARY AT BROWN’S HALL IN MILL VALLEY, MARIN COUNTY CA. CONCERT POSTER, UNKNOWN ARTIST. THE PROMOTER IS MAGIC MOUNTAIN WORKSHOP. Concert Poster is in very good. Condition as shown in the photos. Poster has not been displayed and is free of pinholes. Measures approximately 11 inches by 17 inches. Please examine the photos and ask questions. Photos are part of the description. Be sure to check out our other listings for more cool stuff.