Getting old. Sold the ranch. Sold the tractors. Moved back to the city.
Count the number of disc openers and measure the distance in inches between a pair of them. You'll get a number like "17-7" which is the model number. I've seen 13-6, 15-7, 16-7, 17-7 designations for van Brunts.
Van Brunt made drills for many companies, JD included.
BTW: your VB looks similar to one of my Minneapolis Moline P3-6 drills (20 drops, 6" spacing, single disc openers).