The way we know this doorstop maker today is that they marked their cast iron items on the back with the name "VERONA". Not only did Verona make doorstops, they also produced: Bookends and Ashtrays. All cast iron items (except for the 2 roosters) had a bronze finish. There was a Verona Steel Casting Company located in Verona, PA in 1913. Verona, PA is a suburb of Pittsburg, PA. Verona Steel Casting Company was formerly "General Casting Company" until 1910 -- see photo below:
They produced their first casting in 1905. However, there is no proof that this company specifically made doorstops.

MARKING STYLE
VERONA.
OR
VERONA. and a 3 Digit Number

Their noteable Cast Iron Items:

DOORSTOPS
Large ROOSTER #692 (15 inches) - shown on this website
Small ROOSTER (12 inches) - shown on this website
GIRAFFE #699 - shown on this website

BOOKENDS
CATHEDRAL - shown on this website
The THINKER
SHIP
HORSE
SCOTTY
INDIAN
ABRAHAM LINCOLN
LIBERTY BELL
PIRATE
HUCK FINN & His DOG # 969
NUDE WOMAN

ASTRAYS
(on Right) Colonial Man Astray # 811, # 813 composed of 4 separate pieces. Each piece is marked. It's 23 inches high. His hands hold the ashtrays (not shown