A few interesting Goodwill finds

[bushman]

Stopped by the Goodwill outlet store today and found these.  The add on number pad sticks on to a 2500 style telephone to give someone larger buttons.

Bushman

[WEBellSystemChristian]

That "Hertz" cord is interesting. Maybe it was a promotional givaway item from Hertz?

[Wayback Mike]

I've run across a fair number of frequency ringers but you seem to have stumbled across the elusive frequency cord.   

[bushman]

I'll have to count the hertz and see what the frequency is.

Bushman