I believe the first full lug Model 29-4 was manufactured for Hill Country Distributors in 1989. The run consisted of 500 units that featured a 5-inch barrel, unfluted cylinder, Hogue rubber grips, smooth target trigger, and plain ramp front sight. Similar guns were also made in the 29-5 and 29-6 model variations. The Classic DX line was only cataloged for a year and featured a round butt with combat style grips.
Generally speaking, the last Model 29-2s with a 5-inch barrel were shipped in 1963. One of these in 95% or better condition will cost between $4,000 and $6,000. Approximately 300 of this configuration were shipped by S&W from 1957 to 1973, but the majority were shipped in 1958 (44 Magnum, Pre-model 29, 4-screw frame) and 1963 (Model 29-2).
In the photo below, the two Model 29-2s with a 5-inch barrel were shipped in March 1963. Click on the photo for a better look.
Bill