What is this Port? It is not a 16mm type cable. It belongs to the "Grundig EN3" an old voice recorder from the 50s/60s. I want to plug headphones in, Im asking
Vintage Technics, Grundig EN3 Luxus
File:Grundig EN3 Cassette.jpg - Wikimedia Commons
Grundig EN3 Voice Recorder Dictaphone (Vintage) | Other Audio | Gumtree Australia Moreland Area - Brunswick East | 1204166182