signed and numbered 16/250 lower right in blue ink titled lower left in graphite date unknown: circa 1960’s – 1970’s

signed lower right in green ink titled and numbered 12/75 lower left in graphite CALMA Company information printed along the bottom edge of the paper Winsor & Newton company label printed on the back of the matboard 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

signed, copyrighted, and dated lower right in red ink titled lower left in graphite

signed lower left in red ink titled and numbered 3/25 lower center in graphite date unknown: circa 1960’s – 1970’s

signed lower right in red ink titled and numbered 2/40 lower center in graphite date unknown: circa 1960’s – 1970’s

no visible inscriptions California Computer Products company name printed along the bottom edge of the paper date unknown: circa 1960’s – 1970’s