Check Neumann Serial Number Fix -

Verifying Neumann U87AI manufacture year and circuit differences?

If you are looking at a vintage Neumann, the serial number might also be printed on the internal chassis. To see this, you often have to unscrew the bottom bell and slide the housing off. Only do this if you are comfortable handling sensitive electronics, as the capsule is extremely fragile. How to Verify the Manufacturing Date check neumann serial number