Well, the mystery deepens! A quick search of Yahoo for Al Gallman Pontiac turns up some useful (maybe) info.
Here is an unusual auction on ebay, appears to be some type of dealership trinkets or such:
http://www.ebay.com/itm/33-pieces-Chief-Pontiac-Indian-Al-Gallman-Gallmanville-Fla-/351702142568
Might be worth making a contact with this seller and find out what it is and what else they may know.

Some business info here:
http://www.bizapedia.com/fl/AL-GALLMAN-PONTIAC-INC.html
The registered agent is likely an attorney in Fort Myers, he might know of someone to contact from a historical basis

You might also post in the Fort Myers Craigslist looking for information - looking for people who worked at the dealership.
Cal