HEIGHT = 4 inches
WIDTH = 7 inches
VALUE = Questionable

MARKING :
Spencer, Guilford, Conn

Note 1
Smith's & Bertoia's books list this as a doorstop and the reason, it is shown here.

Note 2:
Notice, this Doorstop has a flat protrusion extending from its back. This protrusion is designed for sitting under books for stability purposes.
This is typical of a lot of bookends.
Second, its height is very short (4 inches) typical of a Bookends and not a doorstop.

Note 3:
Both Bertoia's ($250) and Smith's ($900) books list this as a doorstop.