This serial number decoder accepts all types of Boss compact pedal serial numbers. The different types 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. If you do, please post on the forum.
