HEIGHT = 15 1/4 inches
LENGTH = 7 1/8 inches
VALUE = $750- $925

Marking :
NATIONAL's Version --
56
See View "M"
( The number is in script, typical of National's markings )

GREENBLATT's Version --

COPYRIGHT 1925 BY A.M. GREENBLATT STUDIOS 12
(the marking 12 is located by itself at the middle bottom
See View "3"

Note:
National sold this doorstop unpainted for 75 cents or electroplated with brass, copper, or nickel for $2.40 per National's 1920's Catalog.