While my examples of an older 7-shooter date from the 30's & 40's, the old Russian 1895 Nagant dates back to the end of the century before last. The Belgian brothers Nagant designed a wondrous piece of Victorian engineering - over four score years before the 586/686 hit the streets - before the 'plus' versions by a bit more. So... 7-shooters have been around for a while... they are 'traditional' - not so much as the sixshooter, granted.
While I have five Nagants, I only have one 686 - and it's a 686P - 7-shooter. Furthering it's odd nature, mine is a 2004 'Stocking Dealer Exclusive' - with a 5" barrel and a partial lug. It's a beauty - it came with Ahrends square conversion grips in cocobolo, a HiViz front sight, and a V-notch rear sight. It takes the HKS #587 speedloaders - which function fine with .38's or my wimpy .357M's. The trigger eased up nicely with break-in - and responded well to spring changes - a slick trigger which rivals my 66's. The 686P has one major fault... it isn't a 627! Seriously, my 5" JM PC627 V-Comp, my first 8-shooter, was a fine revolver - my best-ever trigger - just 'clunky'. I bought a 4" 627 Pro 5/08 - it started a trend - I bought more 627's! While 7 is nice, 8 is nicer!
Seriously, if you want an extra round - get a 686P - want two extras, get a 627. Obviously, I don't worry about the IL. I haven't found a new S&W that wasn't perfect, either. Oh, I find fault with some - oddly, two of my oldest - a 625-6 from 1996 and a 625-7 from 2001. Both have laser-etched barrel nomenclature - which has seriously faded over years of wiping the bright SS barrels with cotton rags. Roll-imprinted, they'd still be fine. Nitpicking!
Stainz
PS The 'other' 7-shooter: