The U.S. manufacturer Irwin made some very nice helicopter toys over the years.
I posted a few a while back under the Batcopter post link:
viewtopic.php?f=32&t=1245&p=6136&hilit=irwin#p6136
Recently, I picked up another rare survivor that was released under a previously-unknown-to-me "Motorcade Wheel Toys" line. Once again, the helicopter is modeled after the Sikorsky S-51 and is very similar to the "Build-Your-Own Helicopter" kit released in 1953.
By the way, I was able to find the patent for the toys, submitted in 1953 and finally approved in 1956, online.
I think the display box for this toy is really attractive. Also of interest are some markings which, I believe, reference the type of plastic used. There's a strong-man logo with "Steel Strong" and "Ivilan 77"" on the box.
The helicopter is nearly 15 inches long and 5 inches tall. An impressive toy!
Here's a photo: