Well... another found me, picked it up just after I left work today
Another old, but pretty nice condition S&W top break. This one is about 6 or 7 years older than the S&W Safety Hammerless or Lemon Squeezer I got back earlier this summer. This is a Double Action Model 2 2nd version, it dates to 1880/81 time frame with a fairly low 5 digit serial(considering over half a million were made), the Safety Hammerless dates to 1887. And it has a clean bill of health, locks up tight, no cylinder timing issues, not bad for a 136 year old hand gun. These were made in .38 S&W and .32 S&W, and were in their original loadings, black powder. It came with a spare barrel, both are usable and pretty close in serial, the actual matching barrel is still fixed to the frame. Sadly, the original nickel finish was stripped, as I understand, it was rough as a cob and the previous owner had it and the extra barrel renickeled, but surprisingly it still has the original grips present.
This is a .38S&W(left) 9mm Luger(right), first developed in 1877, it's not a commonly seen round today, most recent production is typically a 145 gr bullet, either FMJ or lead round nose can be found depending on the manufacture. The S&W round is actually a hair larger than .38 Special, .38spl fires a .357 dia bullet, .38S&W fires a .361 diameter bullet, trying to fire a .38spl in a .38 S&W is dangerous and a .38S&W should not chamber in a .38spl. I'd guess on a ballistic chart, it would fit just around in the .38spl to .380acp range.