Hi,
I've found a pre-owned MK1 for fairly cheap. There are plenty of photos, and the owner seems to be responsive/genuine, however I would still basically have to buy this bike 'blind'.
Is there anything I should know before buying such an old Birdy? Is there anything I should ask the seller specifically? I should mention, this would be my first folding bike, so I'm totally unaware of what to be looking out for.

Would appreciate any and all advice re. purchasing pre-owned Birdys - Thanks!