with the physical design (e.g., does the serial number match the "purple badge" or "p48" era of the U87?).
To ensure that your Neumann serial number is verified correctly: check neumann serial number better
on the official Neumann/Sennheiser registration site. Inspect the etching for professional, industrial quality. with the physical design (e
Modern Neumanns use a global six-digit number that does not directly indicate position in a run. You must use the online tool. with the physical design (e.g.