O, very nice.

Should be a KRA59 top, KRA429 mid and a KRA352 bottom.
They are all date stamped behind the model number, there will be a two digit stamp designating the year made. Ex. 79 --> 1979. The middle and bottom are newer, look like late 70's up to mid 80's boxes.
Random question, can you measure from the floor to the front edge of the top compartment in the top box for me?