My grand dad sold Oliver horse drawn equipment from the late 20's until the early 50's. He sold  primarily walking plows, cultivators,planters, some riding plows and mowing machines. His nephew took over and sold Oliver equipment until 1965. I have a dealers price list dated August 10th 1938.
The model 19 listed for $15.50, some plow parts sold as follows:
handles  $1.90
steel shares $3.30
clevis $0.60
I have  models 13, 18, 20 and a model 51 hillside plows. I also have a walk behind planter. These were sold by my grand dad.