This image which measures 2″x 2.5″ was bought at an Antiques Fair near Stafford last weekend along with many others.
The two ladies in the photograph appear to have signed their names on the back Joan Plowman & Joan Bagby.
This probably would have been taken by a street photographer as it has a reference number on the right of the image (I left the number out of the scan).
The people in the background are almost as interesting as these two young ladies; the gentleman in the cap, the lady partly obscured directly behind them and the people in the far distance walking away.
I would say the image is 20’s/30’s judging by the fashions.