Welcome to the forum.
Your 622 with a 'T' prefix to the serial no. was made in 1957, first year of production for the 1st Model (1957-73). It was offered in two configurations: small, rounded butt with 2.5" barrel -or- square butt with 4", 6" or 10" (extremely rare). Standard finish is blued, grips panels will be White or Black. It is a solid frame, 6 shot, can be fed .22 s, l or long rifle (including high and hyper velocity rounds) and will have the "All-in-One" ejection system - pull the cylinder and use the cylinder pin to push the extractor out dumping the casings.
Currently, RETAIL values are a bit depressed for this class of "simple" revolver, topping out around what you paid for yours. A NIB example may sell as high as $155-160.