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As i understand it, angles were between 17 and 20 degrees, however all razors were ground by "hand” on large grinding wheels so you may find a wide variation... maybe from 15 to 21 degrees.
It...

Those old Sheffield wedge type razors were honed very similar to what we do today; they only lift the spine to remove the wire edge just before honing (similar to what we call “breadknifing”).
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