The Walrus is camouflaged. Look closely at the elevators, you can just make out the demarcation. Also the undersurface of the top wing clearly shows a lighter colour. Without knowing the production date, and for that you need the serial (unrecorded as far as I know for 1942), it's impossible to say whether it is in S1E or TSS. Both used the same upper surface colours which were very low contrast on panchromatic film.