These are two new SE06 chairs with higher seat height compared to the 1960s seat height (this seat height is 46 cm and made by Spectrum due to higher average height people and thus furniture).
The saddle leather was completely renewed at Spectrum a year ago, when they still supplied it (the original leather is no longer supplied by Spectrum, and so is the chair). Proof of its originality can be seen at the bottom of the chair, where the leather is extra stitched and consists of several parts instead of one straight piece. The thickness of the saddle leather is original! This makes this set a pristine new version of the chair that is no longer available.
The leather has a nice patina, see pictures.