It is a Model 67, the stainless version of the Model 15. Its proper name is Combat Masterpiece. I would concur with the pricing were the original grips installed. You should be able to find period correct ones for $50 or less.
Welcome to the forums ( I believe it was the Kadet).
Welcome to the forum. I think your gun would have a $500.00 (or more) asking price in these parts. Can anyone but LEO's and such still own a gun like that in California with all the new "safety requirements"?