Inscription
lower right below platemark in graphite: OK #13/1 / SL [circled]; lower right corner in graphite by unknown hand: 1 Black C 13 / 2 spit charb. con. / upside down / 3. Blue / 4. Yellow / 5. Red / 6. spit charb Ri[not deciphered]; lower right verso in graphite by unknown hand: Color & Black, 30 x 20/1 OKTP
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