Inscription
lower right in graphite: Kamil Lhoták 1966; bottom right in graphite: 2/50 Tindrichal Chalujeckému Joratelsky [?] Kamil 10.3.1966
lower right in graphite: Kamil Lhoták 1966; bottom right in graphite: 2/50 Tindrichal Chalujeckému Joratelsky [?] Kamil 10.3.1966