The data file clip was provided to attach handbooks and others reference items to the spacecraft interior to make them accessible during mission operations. It was spring loaded with a Velcro patch on one side for attachment to Velcro strips in the command module.
This clip was flown on Apollo 11 and 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.