This means there is no "choke" or narrowing of the barrel at the muzzle.
leave off the 19 on the serial number as this is my 1957 manufactured model 12 riot
it is a matte finish that is very durable--not shiny so you don't have to worry about the finish as much. Less oiling/rust worries.
The original finish that was used on the RIA M1903 was parkerized and not blued. The parkerized finish is much more?æappealing.?æ
made about 1933.............value depends on condition
Originally, none of them. They were produced in blue. Rifles that came back through for an arsenal rebuild in later years were Parkerized if the bluing was in poor condition.
Decades and decades
Parkerized finish is a non reflective matte type finish (black). It is used on military weapons to prevent reflecting sunlight and giving away a soldiers position. It is also called a phosphate finish. It is produced by a chemical reaction with the metal itself rather than being painted on.
100-300 USD
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A person's opinion may select each of those as a valid answer. It depends on what the pistol is to be used for, such as combat or self defense.
Not enough information. Maker? Serial Number? Markings? Type of grips? Price range could be from 500-5000.