shu9265, Your gun is the version brought out about 1923 - same action as the Model 23-A. They were made until 1933 and the serial numbers fall between 25,000 and 45,000 - the serial numbers were re-started at 25,000 and again at 45,000 for the Model 19-33. For the year of yours, it's just a guess based on the total number and where yours falls - but you have to consider the last 2 years of production would have fallen in the depression years and it is not know how close they came to the 45,000 when they started the numbers over - it looks to me they just picked nice round numbers and actual production numbers could be a lot less.