Why would some petty lord have a sceptre and keep it in a private throne room?
A egotistical baron might make a crown for himself, but it's not likely his statue would have a crown, unless he commissioned it himself or something. Anything is possible, but generally, if it quacks it should be a duck unless some exposition is provided to explain why it's not.
So if there are lords in Bridgeport there should be even more barons.
"The head of the city council is the Lord Mayor, who is elected by the council aldermen to serve a limited term. Beneath the Lord Mayor are Aldermen and Councillors who represent city wards.
Bridgeport is a Free Imperial City, meaning the Lord Mayor answers directly to the Emperor. In practice, the City Council wields a great deal of power."
In the real world there is such a thing as a baronial coronet, though whether a baron would be 'crowned' with it is another question.
That's just for coats of arms, isn't it? Did they ever actually physically wear them?