I have a 586-3 with a 3" barrel. Serial number is BSA30**. I purchased it used about 4 years ago. I dated it to 1993. My mind is failing, but I seem to remember doing some research and finding that a run of 500 or so was made, in the '93-'94 timeframe. Don't know if this was a Lew Horton run or not. I thought I paid a little too much, but I have never seen another one in person. My cylinder is fluted and appears standard 586 fare. I cannot remember which cylinder release thumb piece my gun has. I didn't give you much to go on, but hope it helps. Good luck!