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Different types of Boss pedal serial numbers are shown in the images below.

Type I – Used from late 1977 until early 1981

Type II – Used from early 1981 until early 1989

Type III – Used 1988-1989

Type IV – Used between March 1989 and October 2010

  

Type V – Used from November 2010 until present

Note that the algorithm for serial numbers of type I, II and III are not confirmed and must be regarded as at least +/- two months of the real production date. You may also find odd serial numbers that doesn’t match the expected year of production.