I just received a letter on my 1957 4 screw pre-29 from Roy Jinks and I am still unclear as to what grips came on my gun. The letter says: "... checkered Goncalo Alves target grips". Would these grips be "Cokes" or in 1957 did the factory ship targets both with and without the slight palm swell? Also, should they be relieved or not? Thanks for your help!