Hello
That Depends on when it shipped. Here is my {Ford's Refinished} Model of 1951 That shipped with the Non Relieved ones shown in Walnut wood...They started showing up in Late 1950- 1951 time frame as being an Option and were a standard cataloged item in 1952 forward..In 1956 they Offered them in Exotic wood for the K-Frames and N-Frames...Hammerdown