I just added an older Model 39 to my collection marked "ILL. S. P. 1462" on the frame, which I venture to guess might be Illinois State Police. I may have overpaid a little ($460) but it was in pretty decent shape and Model 39's are getting scarce, and police marked guns always add a little interest to me. I was trying to date it, but the S&W book doesn't give great detail on dating older model 39's. The serial # is 860xx-would anyone be able to give a close date of manufacture for this one? Additionally, for those of you that shoot yours, do the Model 39's seem to like the older standard 124 grain bullets or the lighter ones? Many thanks in advance for any available info!