HEIGHT = 4 3/4 inches
HEIGHT = 6 inches
VALUE = $350 - $500

Marking :
126

Note 1:
Per National's 1920's Catalog, this Doorstop sold for 30 cents Rough or $1.20 Plated.

Note 2:
"Duck Door Stop" is the name listed in National's 1920's Catalog.

Note 3:
The size of this piece would tend for one to think this is a bookend. However, in National's Catalog this is listed as other doorstops were.