Inscription
lower center in graphite: Jaroslav Serych 93 / Jean [?] Gerald Cerné, P.h.D. [?] Jaroslav Serych; lower left: 26/200; verso upper right: 1500
lower center in graphite: Jaroslav Serych 93 / Jean [?] Gerald Cerné, P.h.D. [?] Jaroslav Serych; lower left: 26/200; verso upper right: 1500