After 30 years, the curiosity is killing me!

UPDATE!
About a year ago, I received an email from Ms. Stanley's son, a Mr. Cunnyngham. Unfortunately, I had just begun chemotherapy and my computer crashed before I could answer him! Of course, as luck would have it, I lost his email address, along with a host of other files. So, Mr. Cunnyngham, if you are out there, please, please contact me again.

The locket (shown on the right) was given to me as an opening night gift in a production of The Shadow Box in 1979. The giver of the locket, Madelyn (Phillips) O'Neil, had been presented with it on her Broadway debut by the British actress, Pamela Stanley (shown left, as Queen Victoria on a tobacco card dated 1937), who played Ophelia to Leslie Howard's Hamlet at the Imperial Theater in New York in 1936.

The piece looks strangely like the locket given to Robert Downey, Jr. (Robert Merivel) by Sam Neill (as King Charles II) in the 1995 film, Restoration, doesn't it?

Anyone who can help me discover the origin, age, and meaning of this piece, or any information regarding the life and career of Ms. Stanley, will receive an autographed copy of Winter Fire. To be in the running, please send me an email with your findings. Guestimates are welcome, but all information must lead to definitive answers! Winners will be contacted for their snail mail addresses.

So far, this is all I have been able to ascertain about Pamela Stanley's acting appearances:

Theatre

• 1933 - Bird in Hand, by John Drinkwater, Oxford Playhouse, Beaumont Street, Oxford, Oxfordshire
• 1933 - If Only Father, by Roy Jordan, The Savory Theatre, London
• 1934 - The Country Wife, by William Wycherly, Ambassadors Theate, Westminster, London
• 1934 - The Comedy of Errors, by William Shakespeare, Open Air Theatre, Regents Park, Westminster, London
• 1935 - Chlorida, by Ben Jonson, Open Air Theatre, Regents Park, Westminster, London
• 1936 - As You Like It, by Shakespeare, Open Air Theatre, Regents Park, Westminster, London
• 1936 - Hamlet, by Shakespeare, Imperial Theater, New York
• 1937 - Victoria Regina, by Laurence Housemen, Lyric Theatre, Westminster, London

Film

• 1936 - David Livingstone (as Queen Victoria)
• 1938 - Marigold (as Queen Victoria)
• 1970 - The Last Grenade (as the Governor's Wife), with Richard Attenborough and Honor Blackman

Television

• 1969 - P. and O., by W. Somerset Maugham (as Miss Carey)

P.S. I have contacted Actors' Equity of the UK and they were not helpful.