I like that design, takes me back to the days. The missing lug nuts and center caps drops the value to me. That said, I would go $300.
They look wider then the stock TR4 wheels. When I had a 4, I widen the wheels to accept SP190 Dunlops with no problem. The car handled much better.
If they are made from magnesium, I have heard there are issues you should be aware of. That is they are highly susceptible to corrosion from the elements and if not correctly maintained will fail structurally.
Just a cautionary note.