Hi Allansto,
I would think about a couple of things.
Firstly, the seller isn't a music retailer or the owner, so may not know much about the instrument or saxophones. I would take their assertions about its condition with a pinch if salt. Given its age and depending on any servicing (probably unlikely for a student horn) and how much it has been played/ how it has been stored it may need work doing - at least a basic service, it may be more. You should budget for that.
I'm not sure what your import charges would be in total, but do a calculation to see what you would you would actually pay. It might be more economical to buy closer to home and you get the chance to try. There is a 30 day return policy, but that would be an expensive option.
Find out as much about it as you can before committing if you are keen.