RUSSIAN SCHOOL, 1920 Pair of initials with industrial motifs

each signed with initials in Cyrillic ‘N.P.’ and dated ‘20’ (lower right) ink and watercolour on paper (i) sheet: 14.4 × 10 cm; image: 11 × 8.8 cm (ii) sheet: 14.5 × 10 cm; image: 11.6 × 8.7 cm Executed in 1920.