One, these turkeys take a lot less time to cook as they aren't pumped up with salt water.
Two, the oven is a 1934 Garland gas range, packed with asbestos and gas fired. It holds moisture just like a roasting pan.
Three, he was a young tom, only six months old.
Four, I never cook a turkey to more than 165F in the thigh. I stuff it with hot stuffing, and start the oven hot, then turn down just as soon as the skin starts to glaze. That helps hold the juices in. When the bird is done, the stuffing isn't, so I pull the bird, put the stuffing in a casserole and put that back into the oven to finish, then cover the bird with foil and towels and let it rest 20 minutes before carving.
As this was my first big turkey ever, I called the Butterball hotline, and they estimated 11 1/2 hours to roast. So I dutifully put it in the oven at 3 a.m. for a 3:30 p.m. Thanksgiving dinner...and he was ready by 9:30 a.m.