Kazansky, Konstantin Mikhailovich (1901-1942) Two sketches of an ex-libris or a book saver

Beginning of the 1920s. 
Paper glued to paper covers from stationery folders, ink, pen, watercolor, gold paint.
Horizontal oval 11.5 x 16 cm, sheet size 17 x 22.7. The oval is vertical 14.5 x
11.5 cm, the size of the sheet is 20.5 x 17.3 cm. On the horizontal sheet of paper inside the picture ink signature "Konstantin Kazanskiy"