“Briar root” wood dial?

[miamiclay]

At the Phillips Geneva auction last weekend, one lot was THIS 18039, described as having a “briar root wood” dial. Briar root would be a reasonable dial choice, as it has interlocking grain like burls, minimizing checks or cracks in drying (one reason briar is used mostly for pipe bowls).

However, as far as I know, the only wood species offered for the 1803x dials were walnut, mahogany and birch burls. Is briar root another option Rolex offered (perhaps only briefly circa 1983), or is this just an error in Phillips’ auction description?
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