1940s, 1890s & I'm guessing 1870s Scottish
Not to belabor the point but the bottom metal on these two Smiths is dramatically different. They do look similar (clearly related) but also very different.
This outing yesterday was my 1st really successful target shoot with this Quality 1 gun. I'm fighting some vision challenges in my left eye (& I'm a southpaw) but I somehow seemed to adapt to my circumstances and shot my gun well on the clays yesterday. I notice that on this Quality 1 that very little "lead" is built into the gun and I found that in order to consistently break clays with it, I had to completely cover the target (much like other European shotguns I have shot). I wouldn't have expected that in an American gun, & certainly not in the later versions.
Something else, I really appreciated the considerable weight on my circa-1891 gun yesterday. My game guns (in this application) would have beaten me silly. Really made for a fun shoot and I got to use my "3-position safety' a lot on the trap range. A very practical application here.