Here are the Date Codes Deciphered:
First column is the year of manufacture. Second column is a number which represents the year of manufacture in the backstamp. The Third and Fourth columns are letters which represent whether the plate was made between January-June (column 3) or July-December (column 4).
Example: 20A = July-Dec/1962
I guess the point was if the diner turned the plate over and saw it was made thirty years ago, that may indicate that the meatloaf was possible old as well so the codes kept the nosy from the truth.
| 1950 | 8 | M | A | 1959 | 17 | W | J | 1968 | 26 | R | G |
| 1951 | 9 | N | B | 1960 | 18 | X | K | 1969 | 27 | T | H |
| 1952 | 10 | O | C | 1961 | 19 | Y | L | 1970 | 28 | U | A |
| 1953 | 11 | P | D | 1962 | 20 | Z | A | 1971 | 29 | V | B |
| 1954 | 12 | Q | E | 1963 | 21 | M | B | 1972 | 30 | W | C |
| 1955 | 13 | R | F | 1964 | 22 | N | C | 1973 | 31 | X | D |
| 1956 | 14 | T | G | 1965 | 23 | O | D | 1974 | 32 | Y | E |
| 1957 | 15 | U | H | 1966 | 24 | P | E | 1975 | 33 | Z | F |
| 1958 | 16 | V | I | 1967 | 25 | td>QF | 1976 | 34 | M | G |
Wallace China Cartoon Cowboy pattern plates; I wish I had a picture of the backstamps as these are pretty unique.
Two are 8.25" and one is 6.25". These are actually marked: Shenango of California, which means they were made between 1959 and 1964 after Wallace China was bought by Shenango China.
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©1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Chris Trent