Redfield #70K - Hunter knobs.  (Note - the Redfield and Pacific micrometer sights require the elevation slide to be completely unscrewed from the base to dismount for bolt removal, totally loosing the elevation setting).  By contrast the Redfield #102K and Pacific Model K1 slide free of their bases, when the coin-slotted lock screw is removed.  A set- screw allows return to correct elevation, if utilized.

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