This is the early version of this part. After the late 1970s - early 1980s the part was made with a hexagonal hole so that minifig accessories introduced during this period could be placed there when the part was used as a maxifig hand.

This Item is similar in mold type to the following Item(s):

• Part 3614b Plate, Round 1 x 1 with Towball with Hexagon Shaped Hole (Maxifigure Hand)