WASHBURN'S M-SERIES BASSES The Washburn M-series has become something of an enigma. It gained the majority of its notoriety due to Peter Steele of Type O Negative. There is very little information on this limited run of instruments, so much so that I've read about inquires to Washburn turning up nothing, as those originally involved with it are likely no longer with the company. To make locking down details even more difficult, a lot of the input on the forums contradicts itself. M13 There is a third model that Washburn offered which was called the M13 and resembled an M10, though it did not contain potentiometers. Instead, it only had a stomp pedal-style on/off switch and a blue jewel indicator light. Per Frank Cavanaugh, the M13 was designed for him to accept any string gauge and tuning, plus be able to take a beating on the road. This is from an interview with Seymour Duncan before he left Filter in 2002, so this confirms Frank's first M13 was built no later than 2002. The interview stated that the M13 utilized the STK-J2B Hot Stack jazz pickup. I've seen them in solid drab green and a drab green/black flag motif, both subtly textured with a dull satin, bedliner-type finish. There was an M13 on Reverb with a serial number indicating that it was made in 2003 - it is the only M-series bass that I've seen with a model designation ("M-13") on the headstock.