FYI, since it's newer than 1911, simply a John Deere drill.
"The two companies consolidated in June of 1911, As many large farm machinery builders did, Deere took advantage of the name, reputation, and good will of their newly-acquired company. Thus, the new grain drills, broadcast seeders, and lime and fertilizer distributers, being sold through the various Deere branch houses all bore the name John Deere-Van Brunt. This was true until about the 1960s, when the Van Brunt name was dropped."
Yes, it looks like a "B" series drill to me. That was one of the first implements I pulled as a kid, with a DEERE 830!
You can view, download or print the parts catalog at the link below.
Do you know what model you have... for instance a "24 X 6" would have 24 openers on 6" spacing.
I took a QUICK look at the parts catalog, and only saw one seed chart part number, M18023 which (unless a closer look at the catalog turns up more options, for different sizes/row spacings) is still available to be ordered through your DEERE dealer for twenty-some bucks.
A manual should have the charts in it, as well. I will look tomorrow... I have quite a pile of drill manuals and there MAY be one for a "B" in there. Otherwise, check Fleabay, or you can get a new one direct from DEERE by calling 1-800-522-7448 (likely about $3000).