Antique Doorstops fall into one of four categories: cast iron, spelter (pot metal), solid bronze, and bronze-clad. In the Roaring Twenties, a handful of US companies working in bronze-clad were thriving. (Most bronze-clad bookends were made during the Art Deco Period of 1920 to 1935.) The company we know as Armor Bronze started as The National Metalizing Company. Started around 1910, their products included Lamps, Doorstops, Bookends and Trays. The company resurfaces in Taunton Massachusetts in the mid-1930's, with production ceasing around 1948.

National Metalizing Company published:
Armor Bronze 1922 Catalog
That Publication states:
        "prue Bronze is cast over a core with color (paint) applied to the bronze with the polychrome method."

View 2
Cover page from that 1922 catalog
View 3
Excerpt verifying --
"Bronze is cast over a Core" Beware : This core, mentioned, was a "plaster cast" This is clearly not a cast iron foundry, but a mere company that did coatings. Bronze Clad was a cheap method of manufacturing figures.

Noted Doorstops :
SLEEPING CAT very similiar to Hubley's "Sleeping Cat" except Hubley's Doorstop is 2 pieces.. Armor Bronze's Cat is a solid 1-piece   See View 4
TROUBLED PUP
CAT PLAYING WITH BALL
PARROT on a BRANCH