Kauf W123 Kombi

Hello people! I would have a lot of interest in a W123 station wagon, but I haven’t dealt with the vehicles in detail yet. So I would like to ask what to consider when buying such a vehicle. It would also be interesting to have consumption, insurance classes (because of Kat or so) and everything else that is interesting when buying it. I would like to drive the car as an everyday vehicle, do you think that is realistic or is something to do with the models more often at that age? So thank you in advance for all your information!