I don't know too much about speakers.
I prefer new speakers over vintage ones in my Fenders. I use Webers exclusively and keep the vintage ones in the Weber boxes for resale value.
I have a Weber Thames in my DC-5 that is absolutely incredible, very clean, clear & concise.
I think I responded to another thread that you started about getting more focus out of your DC-5. If tubes don't do it, call Ted Weber, www.tedweber.com.
He knows more about speakers that Jensen & Celestion combined. He could probably identify your speaker's code.
At the very least, he can recommend a replacement based on the tones that you are looking for. Like I said, I use the Thames 12" in my DC-5. I A/B'd this speaker against the Mesa Celestion Black Shadow, Vintage 30, Heritage 30, and many Mojotones and the Thames won it hands down for the tone that I want. It may not work for you though. Ted would know for sure.