CHeck with the maker of the grip.
Personally, I like the HOGUE Rubber grip model 99010.
Economical 22 pistol
Rossi model number 31 had a 4" barrel and was discontinued in 1985. Model 68 came with a 2 or a 3" barrel. There is no model 38 Rossi. Model 88 and 88/2 only came in stainless steel finish. They also had a 2 or 3" barrel. Rossi did make the "Rossi Double Action Revolver" which has no model number. It was 5 round in the 38 special caliber, came with 3 or 6" barrel, adjustable rear sight, fixed ramp style front sight, blued or nickel finish, wood or plastic grips, and was produced from 1965 to 1991. Since you are not able to find the model number, it is very likely this is the gun you have.
Check with Rossi Customer Service at 1-800- 948-8029.
You will have to call Rossi with the serial number to find out.
You will have to contact Rossi
Remove the grips from the gun. There should be a small date stamped on the grip frame towards the bottom on the left side. Mine reads VII.1987, which I believe denotes July 1987.
You will have to call Rossi to find out.
With no other information supplied, 100-500.
.22LR, 10 shot, blued steel, hard rubber grips, made 1932-1942, value about $350-450, depending on condition.
Call Rossi and ask for a manual