Marcelle Quinton was the sculptor of the bust of Bertrand Russell which is on his monument in Red Lion Square London (1982) and of the bust of Lord Wolfson, a trustee of the V and A, which is, or was, on display in the V and A (2000).
Hmm. You may be on your own! I can't find any more Quintons ! How do you know the date? Is it stamped on the piece or is the date your deduction from other evidence? Is there a foundry mark, if the work is in metal ? If so, you may be able to trace the sculptor through the foundry.
Marcelle Quinton has done lots of work mainly in bronze but I believe some early work was alabaster. Her works include Cardinal Newman in the Brompton Oratory, Harold MacMillan in the Houses of Parliament, Lord Carrington at the V&A. She has also done animals and other subjects apart from portrait heads. What is the piece you have?