Inscription
lower left in graphite: 2 Colours / (not deciphered); lower right in graphite: Rudi Lesser / 50; by later hand, lower left in graphite: LESSER, Rudi Hotel Babylon
lower left in graphite: 2 Colours / (not deciphered); lower right in graphite: Rudi Lesser / 50; by later hand, lower left in graphite: LESSER, Rudi Hotel Babylon