Bill Fivaz comment:
Evidently the die sinker at Philadelphia had a fetish for extremely low and high numbers on the last digit of the date, for here's another extemely low punched 6, the top of which can be seen in the denticles under the last figure.
"},{"label":"Collecting Area","value":["Numismatics"]},{"label":"Collection Name","value":["Image Collections"]}],"description":"1866/6 50c","sequences":[{"@type":"sc:Sequence","canvases":[{"@id":"https://iiif.quartexcollections.com/washu/iiif/645e9246-b426-41dc-aa58-340897a0b4c5/canvas/_1","@type":"sc:Canvas","label":"libertyseatedvarieties-ACCESS-076","height":3949,"width":5622,"images":[{"@type":"oa:Annotation","motivation":"sc:painting","resource":{"@id":"https://iiif.quartexcollections.com/washu/iiif/7873a7d2-9661-4fa1-a15b-9c2856d5691b/full/full/0/default.jpg","@type":"dctypes:Image","format":"image/jpeg","service":{"@context":"http://iiif.io/api/image/2/context.json","@id":"https://iiif.quartexcollections.com/washu/iiif/7873a7d2-9661-4fa1-a15b-9c2856d5691b","profile":"http://iiif.io/api/image/2/level2.json","tiles":[{"width":2048,"scaleFactors":[1,2,4]}]},"height":3949,"width":5622},"on":"https://iiif.quartexcollections.com/washu/iiif/645e9246-b426-41dc-aa58-340897a0b4c5/canvas/_1","metadata":[{"label":"Date Created","value":"D:00 M:00 Y:1866"}]}],"thumbnail":{"@id":"https://iiif.quartexcollections.com/washu/iiif/7873a7d2-9661-4fa1-a15b-9c2856d5691b/full/500,500/0/default.jpg","@type":"dctypes:Image","height":500,"width":500}}]}],"thumbnail":"https://iiif.quartexcollections.com/washu/iiif/7873a7d2-9661-4fa1-a15b-9c2856d5691b/full/300,300/0/default.jpg","logo":"https://iiif.quartexcollections.com/washu/iiif/logo"}