Probably a Taurus 66 in .357 Magnum, the Brazilian copy of the Smith & Wesson 66 IIRC. The perps gun looks sandblasted. I can't believe its condition, the only thing that could explain it is carrying it next to a sweaty body for 20+ years in a tropical climate while it continually rubs against clothing covered with dirt/beach sand.
Here is what it looks like in good condition:
Its a Taurus,they dont come in good condition!!!