Watch List notes:

Rocket Mail Cover, 1935, 2 Rupees & Nine Pies Stamp, 8 Feb. 1937, Rocket Mail Experiment By SANCTION SIKKIM DURBAR, Yellowish GREEN Label, 2 Ruppes, "Rocket Mail Experiments", "Sikkim Special Cancellation Seal", "Gangtok Cancellation 9 APR. 35, Excellent Condition, Extremely Rare.

Estimate: 8000-10000 INR