Since more than 1000 guitars were produced many years, the numbers became increasingly inaccurate through the 1980s, ending up about 4 years behind (i.e. a 88xxx serial number guitar would have been built in 1984).
長年に渡って1000種類以上のギターが製作されてきたため、1980年代には不正確になり、4年後に完成した（つまり、88xxxギターは1984年に作られた）。