There are 6 rows of 6 remaining, plus a row of 2.  It looks like there were originally 8 rows, so 10 of 48 stickers have been used.

The last page says the design is based on the official badge of the Air Mail pilots.

The diagonal stamp is a reminder of the new postal rates being introduced on July 6, 1932.

The booklet measures 66 x 146mm.

It is in excellent condition.

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