It is a six-shot. The cellphone pic doesn't show it well, but there is a S&W logo just above the handle (it's faint, but definitely there). There are only four digits in the serial number. I debated blurring the last two out, but wanted to stay in the guidelines of posting serial numbers here.
The gun has been kept in excellent condition. My father was an excellent marksman and always took care of his weapons. It hasn't been fired in 20 years.
Thank you for looking into this!
Added comment: After reading your comments and looking further on the Internet, this gun looks a lot more like a Model 1905, 4th change. I still can't explain the serial number issue.
Last edited by Zuben; July 16, 2012 at 12:47 PM.