Alright, that changes the situation - 'cause what you've got there is neither an Audio Technica, nor an AKG, but an older Ortofon. Looks like it might be an M15E Super or maybe an M20E Super - but that's not quite easy to tell, as Ortofon used that body style for quite a few different models (though most of these didn't have a golden, but a silver coloured generator shell). So what you'd need to to is to check how exactly that rectangular hole on the front is shaped inside and then compare that to the plug shapes of the various needles for that type of body. A good place for that purpose would be Turntableneedles (http://www.turntableneedles.com/ORTOFON_c_25308-1-3.html
), 'cause they have those nice rotating view feature for each of those needle, so that you can easily see the various plug shapes...
Greetings from Munich!
Manfred / lini