It's always a thrill when you find that an old machine has the manual with it. If I haven't got the manual I just oil every obvious place. I let the machine soak up the oil for a couple of days, turning the wheel now and again to check progress.
With this machine the real fun came with the threading, because it is so unlike all my other machines. Luckily I found this video, which brought the instructions to life. It shows the same model of machine in a treadle. I just sat there wondering why other manufacturers didn't incorporate a brake on the treadle. Ingenious stuff.