Sickle Bar IH McCormick 100 or 1100 model ?

[Tanberry]

Trying to restore this IH McCormick Sickle mower . I've conducted a lot of research but i can't determine if its a model 100 or a model 1100 . Can anyone identify it by the pictures ? Was wanting to order a manual for it but was uncertain of the model . It works great and the gears are in good shape .