signed lower right in ink titled upper left corner in graphite titled upper left corner on the reverse in graphite datę unknown: circa 1960’s – 1970’s

in visible inscriptions datę unknown: circa 1960’s – 1970’s

signed lower left in ink titled on the reverse in graphite

signed lower right in red ink titled and numbered 1/1 lower left in graphite titled upper right corner on the reverse in graphite California Computer Products company information printed along the bottom edge of the paper datę unknown: circa 1960’s – 1970’s

no visible inscriptions date unknown: circa 1960’s – 1970’s

signed lower right in ink titled and numbered 1/1 lower left in graphite date unknown: circa 1960’s – 1970’s