Brass tiller yoke, probably English, circa 1880. The yoke is made of a single piece of glass with a rectangular slot at the center.  The arms go out to the sides with an openwork frame and turn down at the ends.  Attached to each end is a brass single sheave block which pivots on a brass pin. (MI-543) 
Condition:  The tiller shows some wear but is in excellent condition. 
Dimensions:  Length 16 1/4 inches; Height 6 3/4 inches.