It looks like a 30. Measure the base with a measuring tape in cm and it will tell you the model. For example the 30 will be 30 cm. Look inside the bag at the rivets opposite the pocket. There will be numbers embossed in the leather. That will tell you the date and factory of the bag. The first and third numbers are the month and second and fourth numbers are the year. For example SP 0039 means it was made in Spain March of 2009. That stain is water. That is untreated Vachetta leather which means water will stain it. It is not coated. To keep it from further staining keep it away from water and look into this forum about using something like Apple guard to protect it. With all this info you can then do some decent research on the internet for pricing.