Dating Gretsch and other Valco-made amps:
Beginning in 1941, serial numbers were on a small oblong metal plate (brass or aluminum) tacked on with two small brass nails. All Valco-made instruments and amps were numbered this way until 1964. Note all numbers are approximate matches.
In 1964, Valco replaced the metal number plate with a rectangular foil sticker with numeric prefixes. A "1" prefix means the amp was built between 1964 and '68. A "2" prefix means the amp was built in 1968.
1940 - 1964 Date Codes:
G suffix: 1940-42
V100-V7500: 1947
V7500-V15000: 1948
V15000-V25000: 1949
V25000-V35000: 1950
V35000-V38000: 1951
X100-X7000: 1951
X7000-X17000: 1952
X17000-X30000: 1953
X30000-X43000: 1954
X43000-X57000: 1955
X57000-X71000: 1956
X71000-X85000: 1957
X85000-X99000: 1958
T100-T5000: 1958
T5000-T25000: 1959
T25000-T50000: 1960
T50000-T75000: 1961
T75000-T90000: 1962
T90000-T99000: 1963
G5000-G15000: 1963
G15000-G40000: 1964
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, Je n'en ai pas encore l'utilité mais je pense que ça nous rendra bien service 
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