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In reference to the patent: US 257,885

The patent has the word "Model" written at the top left corner of its first page. What does that indicate?

Here is a screenshot of the patent's PDF, accessed from Google Patents:

Screenshot of the patent

Does it mean that the inventor presented a model before getting his patent approved?

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Yes, this means that a model was submitted or presented by the inventor. Patent models were required in the US from 1790 to 1880, but the rules have since changed.

If no models was provided, then early patent drawings specifically state "(No Model.)"

For example, the next patent (US257886) states ("No Model.)" indicating a model was not provided.

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Based on checking out a number of patents, the practise of explicitly stating whether or not a model was presented on the drawings seems to have stopped around 1905.

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