Identify Altec 414 Woofer

[mgzny]

Would like to know best way(physical) to determine model of 414 woofer pair.
No Altec 'tag' present, no magnet cover, neither gold nor green.
Black frames. Advertised as 414Z when purchased- just not sure.
Any clues appreciated.

Mark

[hmolwitz]

Is there anything stamped on the back of the cone?
The Z does indicate no magnet cover, but they usually had a black ink marking with the model.
Does it look like an Altec Basket?
Harry