1955 Revell Sikorsky H-19 Rescue Helicopter.

The Sikorsky H-19 Chickasaw, also known by its company
designation S-55, was a versatile American helicopter
developed in the late 1940s. It was widely used by the U.S.
Army, Navy, and Air Force, as well as by civilian operators for
various roles including transport, rescue, and utility work. Its
distinctive design with the engine mounted forward of the cabin
made it a recognizable aircraft of its era.
Revell is a well-known American toy company, founded in 1943,
that became famous for its plastic scale model kits. They
produced a wide range of models, including aircraft, cars, and
ships, often featuring detailed designs and accurate
representations of their real-world counterparts. The H-19
Rescue Helicopter model kit from Revell would have been a
popular item for hobbyists interested in aviation and military
history.