This is a Wedgwood, England molded cream ware or Queens ware lonely saucer made in a pattern Conway in the Edme shape with reeded border and flower bouquet. The pattern was made by Wedgwood between 1915 and 1928.  

The saucer is 5.75 inches in diameter.

The saucer is in very good +++ condition with no chips, cracks or wear but has some minor crazing which is normal for this era and glaze type. In fact it looks as if it has never been used.

Very pretty.  If you don't have the match, saucers make great soap dishes, hold keys and lemon slices on the tea table with panache!