I've shot, hunted with, and collected S&Ws for 40 years. The one you're looking at with the half underlug will probably be the closest appearing gun to the originals we will ever see again from the factory.
Considering the price of the new ones I believe I'd look into an earlier Mod 29-2, 3, or 4 to seriously compare to as an option.
Not to denigrate the later guns, ( I'm currently shooting a 5" 629-6, IL, MIMs and all) and find no fault with it.)
I'm thinking many 95-98% early P&R guns are currently selling for less than new ones. The collector value and upwardly increasing prices of the early guns would certainly protect your investment over the long haul...
Unless you're sure you need the "endurance" package of the later guns you'd be buying the "classic" style you want...
Just sayin'.........