You appear to have either a New Pocket Model, or a New Police, not a Pocket Positive.
The Pocket Positive serials started at 30,000 and the gun would have the Positive Safety in the action, visible as a small lever that moves downward as the hammer is cocked.
This can be seen in front of the hammer as its cocked.
The New Pocket Model with serial 15024 would have been made in 1900.
A New Police with 15024 would have been made in 1902.
I suspect you have a New Police, since it had a larger grip than the New Pocket.
The New Police was announced three years after the New Pocket, and was intended to be a modern police revolver more or less at the demand of Theodore Roosevelt who in 1896 was the new Commissioner of Police of the New York City Police Department.
Roosevelt was appalled at the wild mix of guns, many substandard that were being used, and at the terrible level of marksmanship.
He, along with an expert NYPD shot named Petty were largely responsible for the adoption of the Colt New Police .32 of which the NYPD bought 4500 with serial number "1" going to Roosevelt.
About 49,500 New Police models were produced between 1896 and 1907.
New Police models usually had a circle on the left side of the frame below and behind the cylinder latch with the Colt Pony and the words Colt New Police in a circle around the Pony.
The words Colt New Police were often stamped on the barrel on the Left side.
On your specific gun, I suspect the markings were polished off over the years, and the barrel was likely replaced with a Pocket Positive barrel.