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Instruments previously built in St. Louis Park (a suburb of Minneapolis), MN from 1979 to 1983. Distributed by the Jemar Corporation of St. Louis Park, MN.
O'Hagan guitars were developed by Jerry O'Hagan. O'Hagan, a former clarinetist and music teacher, began importing the Grande brand acoustic guitars from Japan in 1975. In 1979, the O'Hagan guitar company was formed to build quality, affordable solid body guitars. Two years later, the company incorporated as the Jemar Corporation (this designation can be found on the back of post-1981 models).
In 1983, both a nationwide recession and a resurgence in traditional guitar design (the beginning of "Strat-mania") took a toll on the four-year-old company. When a bank note became due, the company was unable to pay. The I.R.S. had an outstanding bill due as well, and seized company holdings to auction off. The O'Hagan company, which tried to provide quality guitars at an affordable price, closed its door for good. It is estimated that only 3,000 instruments were produced during the company's four-year production, with the majority being the NightWatch models.
Serialization ran one of two ways during the company's production: The first serial number code was YYMXXX, with the first two digits indicating the year, the third (and sometimes fourth) digit the month, and the final digits provided the sequential numbering. The second code was probably instituted in the 1980s, as only one digit indicated the year. The second serial code was MYMXXX, with the first and third digits indicating the month, the second digit the year, and the last three digits sequential numbering. Source: Michael Wright, Guitar Stories, Volume One.

From Blue Book Publications:

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