That's a great start! Look on the side of the engine, the number will start with an "M". Look under the steering neck, that is where the frame number is. Let us know the numbers and we will get you a year.
Do you live near Decatur? That is where Wayne Mahaffey is from, and he is the "Simplex Source" for parts.
The only book on Simplex is by Gary Wollard. Look in the for sale section for info.