Not a factory magna port. As for value, the purists will love seeing no lock but hate seeing it ported. The hunter/casual shooter will either love the idea of less recoil or hate the idea of more noise so your marketability in volume of buyers is less than a non-ported 6" but the ports may help someone who wants them choose yours over another non-ported gun.
Given the street price on a new 6" 629 starts at $900 and that one is modified so it's not got the lure of a collector quality old example, I'd say no more than $900. Personally I'd want it a little cheaper than a new one if buying it second hand.