This Smith has a 6 1/2 inch barrel, round butt, S/N 343XX
(5 digits)
Grips are not original (gun was found in a semi protected spot in early '70s, pretty badly rusted but cleaned up good, grips gone)
Action is tight and barrel is in great shape, shoots well.
I am curious about its history, and exactly what it is. If anybody has any idea, I sure appreciate it.