Joe - Thank you for your reply.
It probably is Franke & Co. In taking a close up look with a loupe, it appears to be a definate "T" (with a small cross mark halfway up - so most likely really an "F"), with a smaller "C" superimposed on it. No circle or "L".
As far as I am concerned, Franke & Co. - F&C is it.
Thank you again, Dan