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    Re: On this CP-300\U, recently discussed.
    From: Tracy Shrier
    Date: 2021 Feb 12, 11:52 -0800

    Hi Guys,

    Attached are pictures of my CPU-300/U, manufactured by Allegheny Plastics, and my CPU-50A/P, manufactured by Felsenthal Instruments.

    I would suggest that Michalis Vaidanis' instrument is a -50A/P that had the astrotracker field of view overlay (green disk) never attached or removed to market/release as a -300/U. Maybe the astrotracker function was classified or restricted at the time. 

    Tracy

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