See also: Fetterlock in Pictorial Dictionary of Heraldry.
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A lock similar to a padlock but intended to lock around a horse’s leg to restrain it.
Default orientation: open, bolt to base, keyhole to dexter. No proper coloration.
Closed Fetterlock (2) §
Source: Viking Answer Lady SVG Images For Heralds. Artist: Gunnvôr silfrahárr.