Antique Foot Rest / Gout Stool?

This seems to be the logical explanation, but it could be something different.

Seems to be a design for medical benefit.

Please see photos for dimensions.

A rare 'Patent Numbered' T shaped design, numbers are as follows:

Reg'd Number: 770894
Patent Number: 394429

Seems to be leather upholstery; and a hard wood, maybe oak.

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