Yours have all been
Re-upholstered as the original cushions and backs were in leather and mostly black. Some oak versions had tan leather.
The give away is the seat cushion.
The original had the leather sewn so it overlapped at the sides meeting in the middle with the large button holding it all down.
The idea behind this was give it the appearance of 4 pices but mainly so the leather had movement in it to allow it to take the shape of the back side sat on it.
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