Buddy, you are correct about it's approximate age.
The first model I saw was around 1980.
I am sure that its PL is an add-on option, as it was with all other rigs of
that time.
For the person who asked if it will do echolink, any rig with a touch tone
pad can be used with echolink. Most echolink systems, of course, will also
require a PL tone.
Mike,
K5XU