Secret Surprise Pose
From My Little Wiki

G1 Pretty Puff
This pony pose has a moulded cape on her back which opens up to reveal a little secret storage area. The cape is opened using a key which is inserted into a keyhole on the chest. Unfortunately, the capes and the keys were easily lost.
All four hooves are flat on the ground. Head is turned slightly to the right.
Copyrighted 1990.