This one has attracted a lot of interest so I asked my client if I could have a closer look at it. She says she has had it for a very long time and cannot remember where she bought it. It is made of beautiful supple black leather with a tree logo with MB on it. But it has no other markings and is definitely not a Mulberry. So it is either another brand which has MB as its initials (but it is not a Montblanc), or it is a copy of a Mulberry though the Mulberry logo is never featured like this on real ones.