Bartolini licensed MK-1 preamp from 2015 Lakland 55-01. I bought the bass new-old-stock in 2017. Pre was used for a few months. Push-pull switch on volume for EQ bypass. I will include info as to which wire is neck and bridge, etc. Comes with nuts, washers and knobs but no TRS jack. Worked great, no issues. $45 shipped CONUS.