BIB-507

[
  {
    "507": {
      "ind1": " ",
      "ind2": " ",
      "subfields": [
        {
          "a": "Scale 1:10 of the original."
        }
      ]
    }
  }
]

{
  "mainEntity": {
    "scale": {
      "@type": "Scale",
      "label": "Scale 1:10 of the original."
    }
  }
}