In pencil, center, verso: Arthur Siegel
In pencil, upper center, verso: TOP [with arrow pointing to upper edge] In pencil, upper center, verso: #2 [encircled] In pencil, center, verso: Blue Variation / 1950 In pencil, center, verso: 54 [encircled with X] In red ink, lower left, verso: XX In pencil, lower left, verso: 10345