DD1700 
It should have a tag or plate on the front of the head that says. Generally speaking a series one is about 6 1/2ft tall and a series two is about a foot or two taller than that depending on how they are set up. Sometimes they have a spacer block under the ram, in that case a series one can be as tall as a series two. Horspower on the motor is another clue, I don't think they ever went over 1 1/2 horse on a series one. If it has a v-belt drive that is visible, going from the motor to the spindle it is a first generation series one, and probably the most likely thing to find laying around.
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