It's Standard Pica. Probably a from the J H Shand type foundry, I see them fairly often on Babies.
Otto Koponen indicates that a "1B" foundry mark on a Hermes Baby is likely a standard pica face from the J. H. Shand type foundry.
via https://www.reddit.com/r/typewriters/comments/1vnpxg8/what_typeface_is_a_hermes_baby_1b/