Antique 4 tiered spindle design corner whatnot shelf

My grandfather bought it at a rural antique market at least 45 years ago in Ontario, Canada. I don't know what type of wood it's made of. The finish is faded from the sun. There is a black spot on the bottom shelf. There appears to be a horizontal crack along the grain of the wood near the back of the second shelf from the bottom. Height is 54", depth from back leg to either of the front legs is 20".