Inscription
lower left in graphite: OKTP; lower right in graphite: a. Abts 09.; lower right verso in graphite by unknown hand: Abt: Untitled (12 bits) OKTP
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lower left in graphite: OKTP; lower right in graphite: a. Abts 09.; lower right verso in graphite by unknown hand: Abt: Untitled (12 bits) OKTP