This is a lighter weight lunar hammer designed to chip a sample of rock off a larger rock or to drive core tubes into the lunar soil. When attached to an extension handle, the hammer could also be used to dig surface furrows. Hammers of this style were used on Apollo 11 and 12.
This particular hammer was used for training. It was transferred to the Smithsonian in 1971.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.