Can't help with 1945, but here is what I found in the depreciation list in my dad's farm account book for 1952.
John Deere 'B', on steel, hand crank - bought new in 1943 for $818.
John Deere No. 52 Plow, 2-12", bought new in about 1947 - $242. This was bought after we converted to the gasoline engine, had rubber tires put on and added 5th and 6th gears.
John Deere two-row cultivator for the 1943 'B', bought new in 1943 - $131.
I hope this helps.
Stan (formerly from Indiana)