Impossible to answer without a detailed description of all markings, condition, finish, barrel length, caliber, box, papers, history, etc..
Aubrey O'Day is currently worth 2.4 million dollars.
In 1907 50 cent pieces were worth 50 cents. They are worth more today.
It is worth around 200 to 600 dollar
20p
depending on condition of your revolver it would be worth 775.00 dollars in 50% condition up to 1,000 in 70% condition.
i have found this old revolver in a pawn shop for 20 bucks how much is it worth
50 or so
50-150 or so
$10000.00
The 2 half 1907 stamps are worth 30 cents. There are however very hard to find.
as much as somebody will pay!
50-160 or so