The opener boots do not look correct for a Deere/Van Brunt drill. But can't really see them in the picture. However if it is a Deere drill they where pretty good about casting their p/n on items that where made of cast. Look for #'s on anything cast (like the flat chain sprockets), Deere # series from this time frame will be alpha character followed by 2-4 numerical characters then maybe another alpha character. It won't be newer than about 1950 or so, I think.
That grain drill you have looks a lot like my Minneapolis Moline P3-6 drill with a JD paint job (even upside down). Not saying it's not JD. Just looks suspicious.
I restored two of those MM drills. Bought them from a neighbor for $275. Put about $300 in the restoration.
Your drill looks real nice. I used mine to plant Kanota oats.