Written on the back is:

Record Holders of the World
No.21
MARTIN VIKING
Designed to search out the secrets of the upper air,
this great American rocket set up a world record
by climbing to a height of 158 miles. Measuring 42
ft. from nose to tail. It is powered by a 20,500 lb.
thrust motor, which gives it a speed of 4,100 m.p.h.

A Series of 50 issued with CADET SWEETS
174 Bradford Rd., Trading Estate, SlOUGH, BUCKS.