I purchased this on ebay on a whim. It was sold as B&K but it was clear immediately that it is not. There is a Logo on the side that looks like a W and M woven into one. And a number "1220" on the opposite side. On the back side, there is a CE sign and what is probably a serial number, five digit unlike B&K.
Thanks
Thanks
Attachments
Probably Norsonic 1220.
https://norsonic.asia/wp-content/uploads/2015/04/Norsonic-Microphones-Datasheet.pdf
https://norsonic.asia/wp-content/uploads/2015/04/Norsonic-Microphones-Datasheet.pdf
Thanks. Didn't know the logo, but that is it. Interestingly, in that data sheet, all mics look like B&Ks with the slitted diffusor. This one has the 1220 number but looks quite different with all these round holes.
The grid on yours liooks like the front plate is insulated from the housing. If so it may enable electostatic calibration/performance verification of the mike. The grid resembles the grid on the Gefell mikes https://www.microtechgefell.de/messtechnik-alle