Thank you for you answer!
It is calf skin and it seems to be an "oiled" leather....
It scratches very easily but is semms to be a leather which has been "treated" before.
Sorry for my English.....
Here I send the link to a picture (although from a picture the right treatment might be hard to tell...):
http://usa.hermes.com/woman/shoes/boots/land/land-22305.html
In this case your best bet would be to use
Meltonian All Purpose Cleaner & Conditioner
This is a single product and it's found in a white bottle.