Based on your facts, it appears that the police had no reasonable suspicion to stop you. However, there is no real relief unless you can pursue some form of civil rights violation which is very difficult (not-applicable here) and cost-prohibitive.
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It appears that your 4 semesters of law school paid off. Your fact pattern does not seem to suggest the officer had probable cause or reasonable suspicion to stop you. Perhaps the officer might argue that limos in his jurisdiction are required to have a sticker or some other form of identification (similar to the tags on your license plate) and your limo didn't have such a sign. On your facts alone, it sounds as if maybe the officer was trolling for prostitutes and older limos tend to be the best fishing grounds for that type of fish?
What remedy do you expect, though?
As a matter of fact, a limo here without local tags, in that part of town, very likely *is* engaged in something it shouldn't be--but that alone is not reasonable suspicion (and if it were, driving on Friday night would be reasonable suspicion for DUI!)