Hamer USA Guitars: Serial Numbering System
From 1974 through 1981 Hamer USA employed two separate serial numbering systems, one for custom instruments and one for production models:
Custom Instruments: These instruments are easily recognized by the use of a four digit number stamped into the wood on the back of the peghead. The numbers ran from #0000 through #0680. All of the early Hamer USA Standards and 12-String basses as well as a number of prototype instruments were included in this serial numbering system.
Production Models: Production models are stamped (initially with ink, later into the wood, on the back of the peghead) with either a five or six digit serial number. The first digit indicates the year that the instrument was built. The next four or five digits are sequentially stamped in order of production. For example, serial number 7 0001 was built in 1977 and was the first production model guitar built. Similarly, 0 1964 was built in 1980 and was the 1,964th production guitar built.
The serial numbering sequence by decade is below:
1970s: 7 0001 - 9 1450
1980s: 0 1451 - 9 241920 1451 - 9 24192
1990s: 0 24193 - 9 50155
2000s: 0 50156 - present