1950s 6015 Bubbleback - Unique dial?

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I recently inherited this 6015 which I believe to have been purchased around 1950 which appears consistent with the serial number, 67XXXX, and the date on the accompanying chronometer certificate.

While researching the model, I notice a couple of curiosities; the words "Rolex Oyster" appear on one line. I have only seen this on photos of much earlier models (1930s). Secondly, the words "Rolex Oyster" are in an arc. I have only seen them as a straight line before.

Does anyone have any knowledge of this dial design, or any additional information about these models?

We had assumed a value of around $1-2K when dividing the estate, and for insurance. If a rare dial design, does this materially affect the value?

Thanks