I'm beginning the process of restoring my grandfathers JD "B" tractor. Its been sitting a long time (30+/-) but was running when it was parked and engine will still turn over. My problem is determining the model year. The serial #, from tag under the magneto, is 10980. The charts I've seen indicate that this would be a No for an unstyled B; however, it is clearly not an unstyled B. I intended to post a picture with this post, but it is raining today so I will have to wait on that till later today or tomorrow. My dad remembers my grandad buying the tractor new around 38-40. What am I missing in my search?