Easy, both were wood unless specified different at the time of ordering the revolver....
Finger grove round butt for 629-1 3 "
And Checkered wood square butt for the 629-1 6"
Oh and forgot to add, just about everybody makes grips for both the round and square ..Hogue , Pachmayr, Herrit and so on..Wood, Ivory,Stone inlay,Rubber..Great thing about owning S&W's everyone makes accessories for them..Its the holsters that are harder to find, mainly for the 3 inch..Galco, Desantis and G&G are some of the few..