DIN 41529. The plug point is a dash, the Soviet standard plug for acoustics.

RFID:Image ID:2BM2BJA
Image details
Contributor:
Olga FedoseevaImage ID:
2BM2BJAFile size:
17.2 MB (332.7 KB Compressed download)Releases:
Model - no | Property - noDo I need a release?Dimensions:
3000 x 2000 px | 25.4 x 16.9 cm | 10 x 6.7 inches | 300dpiDate taken:
17 April 2020