what are you boys talking about,
that my little planter, 2-row with 25B planter units is Bastardized from 2 or 3 different planter parts.
here is a picture of another planter, tool bar has 4-25B planter units attached with fertilizer boxes, just like mine has two.
I do not think different parts were mated together as everything fits and works together fine as it should.
you can loosen the tool bar clamp and move each planter unit in/out or take them off. I did see another option to my planter, it had a guide flat disc blade, like a plow coulter blade, in the center to help stabilize the planter so you would get less side to side drift, mine does not have that option.
it does a great job and the corn comes right up using the planter.
I would think its a late 50's or early 60's model.