Inscription
lower right in graphite: M.BALAKJIAN 75; lower center in graphite: Frontier I; lower left in graphite: 6/50; by later hand, lower right verso in graphite: 13885-C
lower right in graphite: M.BALAKJIAN 75; lower center in graphite: Frontier I; lower left in graphite: 6/50; by later hand, lower right verso in graphite: 13885-C