The 034 is an assembly number. It is used to keep the frame and any fitted parts together at the factory.

There is no other spot where the serial number would be located on this model.

With Modern Smith and Wessons, the serial number is always on the the butt of the revolver. With the models that ship with grips that cover the butt, the serial number is also placed in a second (easily accessible) location. Usually, but not always, under the crane

Someone knew that using a punch to obscure the number is far more effective than filing or grinding it off.