I have had this deep brown zip around agenda and cover since about 2006/7. It was part of the Chloé Paddington series. The Chloé Paddington was an it bag during those years and was designed by Phoebe Philo. Philo went on to revitalise Celine, but she will be remembered for this classic style, which has recently had a revival.
This cover is so soft and supple. I am not sure what it is but it feels like soft lambskin, with a substantial lock – not as heavy as the original Paddington lock – and key. You got these with either a notebook or an agenda. Mine is an agenda.
There was also another model made – this one. I sold mine long ago and have really regretted it.