The Murray-Ohio Bicycle (WF) numbers begin with the following letters:
YEAR
1937 M-O-B Plus Serial Number
1938 M-O-C Plus Serial Number
1939 M-O-D Plus Serial Number
1940 M-O-E Plus Serial Number
1941 M-O-F Plus Serial Number
1942 M-O-G Plus Serial Number
1943 M-O-H Plus Serial Number
1944 M-O-I Plus Serial Number
1945 M-O-J Plus Serial Number
1946 M-O-K Plus Serial Number
1947 M-O-L Plus Serial Number
1948 M-O-M Plus Serial Number
1949 M-O-N Plus Serial Number
1950 M-O-P Plus Serial Number
1951 M-O-Q Plus Serial Number
1952 M-O-R Plus Serial Number
1953 M-O-S Plus Serial Number My bike is MOS 2053
1954 M-O-T Plus Serial Number
1955 M-O-U Plus Serial Number
1956 M-O-V Plus Serial Number or M-O-T-V
1957 M-O-T-W Plus Serial Number
1958 M-O-T-X Plus Serial Number
1959 M-O-R Plus Serial Number
YEAR
1937 M-O-B Plus Serial Number
1938 M-O-C Plus Serial Number
1939 M-O-D Plus Serial Number
1940 M-O-E Plus Serial Number
1941 M-O-F Plus Serial Number
1942 M-O-G Plus Serial Number
1943 M-O-H Plus Serial Number
1944 M-O-I Plus Serial Number
1945 M-O-J Plus Serial Number
1946 M-O-K Plus Serial Number
1947 M-O-L Plus Serial Number
1948 M-O-M Plus Serial Number
1949 M-O-N Plus Serial Number
1950 M-O-P Plus Serial Number
1951 M-O-Q Plus Serial Number
1952 M-O-R Plus Serial Number
1953 M-O-S Plus Serial Number My bike is MOS 2053
1954 M-O-T Plus Serial Number
1955 M-O-U Plus Serial Number
1956 M-O-V Plus Serial Number or M-O-T-V
1957 M-O-T-W Plus Serial Number
1958 M-O-T-X Plus Serial Number
1959 M-O-R Plus Serial Number