Brand new in sealed box, MFR- Waltham Watch Company, Mark 2-C Pelorus Drift Sight F SSC No. 88-B-110, complete recording base, paper rolls, and "Installation, Operation and Service Instructions", Bureau of Aeronautics, U.S. Navy the recording base will mount interchangeably with the Mark 2-B Pelorus Drift Sight Base and is designed for use with either Maxwell Smith, Kollsman or Thwing-Alert Optical Heads and Posts.
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