The SN puts it in the range of the 32-20 Hand Ejector Model of 1905 2nd Change- which overlapped the 1st Change. SN range of 33501- 45200, spanning 1906-1909. Page 131, Standard Catalog of S&W.
BTW, that is a REAL nice revolver you have there. Always thought the 32-20 was a better round than the .38 Special. I worked with a gent that carried one for 30 years- when he retired, the VA legislature passed a bill recognizing his service, and awarding him his revolver and badge.
What we have here is... failure- to communicate.