Harold:

Usually it's best to start a new thread when asking about a different song, rather than asking a question in a discussion about something else; also, we have a very good search engine (the "Digitrad and Forum Search" on the main Forum page) which will often find things for you if you give it a try.  A search for sunshine of your smile came up with this:  Sunshine of Your Smile  -the song was written in 1913, apparantly, so may well be the one you're looking for.

There's also a set of sheet music at the  Lester Levy Sheet Music Collection  which you might like to have a look at:  THE SUNSHINE OF YOUR SMILE  (Leonard Cooke / Lillian Ray, 1915)

Malcolm

(Email sent, because I'm in a good mood; as a rule I expect people to come back to see if anyone has answered their question, rather than expect us to do all the work!)