This is a vintage pager from Radio Shack. It was produced by InterTan under the Radio Shack brand. Not functional as it relied on an operator system from the early days of pagers. It does not have a read out display like the ones that were produced later.
The specs on it read:
Serial No 9450447
D.O.C. 104. 011 121
CAP Code 1 0070247
Measures about 9.2cm x 1.5cm x 1.7cm