Little Giant Swage Blocks:
From page 765 of the Carey Machinery & Supply Co. Baltimore, Maryland 1899 Catalog.
These were the typical industrial production blocks of the time and had the option of being machined (planed) flat and models with an integral base.
An industrial block is one with nothing but simple geometric shapes on the edges and numerous cored holes in the body.
The edge features usualy include hexes, 90° V's and half rounds.
The cored holes usualy consist of graduated squares, rounds and sometimes but not always, rectangles.
These were designed in the modern era for industrial shops when they made a great deal of forged hardware such as fasteners.
For more details see Swage Block type definitions.
Also see II&B Vulcan Brand Blocks No. 0½ for later copies of the No.2 block above.