Antique table and set of four chairs

Hello, my mother is downsizing and we are considering whether to sell this antique dining table and four chairs. This belonged to my great grandmother, so is likely 100+ years old. Has a crank to extend from a round 130cm table to an oval 190cm table via two inserts. Unsure of the wood, is located in Australia. Some minor repairs required on some of the upholstery seams on some of the chairs. 

Would anyone have a view on how much this would be worth?

Thanks!

Good