Sound output confirmed from all pole pieces. * One is normal, but the other has unstable resistance and produces noise, so it is treated as junk. This is a Maxon-made violin bass pickup, which was installed in the 1970s Greco VB series, etc. Based on the "23109" stamp on the back, it is estimated to be a unit manufactured on March 10, 1972. This is a Japan vintage part that is perfect for restoring Japanese violin basses and customizing bizarre guitars. The seller themselves has not used it, so the frequency of use is unknown. Please consider this item with the understanding that it is a vintage item. #Greco #Greco #Maxon #Maxon #ViolinBass #JapanVintage #ElectricBass #Pickup #VB450 #VB360 #Beatles #Beatles Points of appraisal and details (researched by AI) Manufacturing year and manufacturer The 5-digit stamp "23109" on the back is a date stamp from **Nisshin Onpa Seisakusho (Maxon/Maxon)**, which supplied electrical components to Fujigen Gakki (Greco) products at the time. 2: 1972 (or 1982, but this shape was mainly used in the 70s) 3: March 10: 10th 9: Manufacturing line number for that day, etc. Based on this reading, there is a very high possibility that it was manufactured on March 10, 1972. Features for violin bass Four pole pieces: Indicates that it is for bass. Size: The width is about 70mm and the length is about 30mm, which is the dimension of a narrow-size humbucker (commonly known as a staple pickup copy) that fits a Hofner type (violin bass). Mounting ears: The shape of the ears protruding to the left and right is a typical shape for suspending with springs on the escutcheon of a violin bass.