Millers Falls No.1, 3, 4 & 5 eggbeater drills
Type Study
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Millers Falls No.4D eggbeater drill;
undetermined type.

This type also has a non-dished (flat) main gear casting with cast-to-shape teeth.
The gear ratio of 44/14 teeth associates it with the Unknown Maker No.4 Type 0 drill, which also has a ratio of 44/14 teeth. In Randy Roeder's catalog study of the Millers Falls line of drills, this model was apparently designed for beginning artisans, as Millers Falls described it as, "designed especially for manual training use."

Millers Falls No.4D drill
Two-jaw sprung chuck used on Millers Falls No.4D drill
The patent history of this chuck isn't clear - the two jaws have a spring stowed deep inside the body of the chuck, but it's not completely hidden from roughly inserted bits.
The crank handle of this drill is about the same size and shape as that of the other No.4 drills, but it's attached with a headed shaft that's been peened on the back side of the cast crank in order to retain it.
Crank handle of Millers Falls No.4D manual training drill
The main gear has no interference between the crank pin and its teeth because the crank arm has been extended.