youngda9 -
Your 629 Classic was produced in 1994. The 629 Classic was introduced in 1990 as essentially a full-lug version of the 629 (a stainless steel version of the venerable Model 29), which debuted in 1979. The -4 variation came out in 1993, with some relatively minor modifications to the rear sight and extractor. It was superseded by the -5 in 1997, and at that time the changes were substantial, including modifications to the frame and internal lockwork as well as the introduction of MIM hammer and trigger. The Hogue grips were standard on all 629 Classics.
I think they're great guns. I have a -3 from 1991 with the 5" barrel that is the most comfortable of my .44s to shoot.