Yes. The Airweight version of the .38 M&P post-war revolver was introduced in 1952. Originally, it had an alloy cylinder as well as an alloy frame. This turned out to be a bad idea and the cylinder was replaced with a steel one.
The early examples also had what was called a "bug" screw at the top of the sideplate to secure the upper sideplate screw, due to the problem of only having a few threads engaging the aluminum allow frame.
One other detail - the frame on these guns is of slightly smaller dimensions than a standard K frame revolver.
What is the serial number on your example?
Regards,
JP