This wonderful pair of vases was made by Royal Doulton, in Lambeth, London, one of England's premier manufacturers of Victorian and Edwardian art pottery, and these are Edwardian, dating to circa 1910. The backstamp is the earliest Doulton mark that bears the royal lion, added following a Royal Warrant granted to the pottery by King Edward VII in 1902.
The founding Doulton's son, John, started a ceramic art studio in 1871 and brought in artists from nearby Lambeth School of Arts where it just so happened there was a seedbed of the most amazing artistic talent. From 1884 Henry Doulton took over the factory and pretty much let these artists do what they wanted and it was artistic innovation and genius such as that of the Barlow sisters Hannah & Florence, ***** ***** & George Tinworth that made Doulton pottery famous the world over.
The handwritten initials you mentioned, "CA", inscribed into the clay of the base are for Christine Abbot, certainly a noteworthy member of this stable of artistic talent, and well known for these beautiful Art Nouveau designs carefully delineated by tube-lining -which is raised paste enamel applied by squeezing it through a tube, very similar in design to a piping bag used for decorating a cake.
As for value, Doulton has not been doing as well in the salesroom as it was a generation ago, but good examples like this by the better artists are still prized by collectors. This pair, the same as yours, but in green sold at auction for $350 which is about right.
If you were to sell at a good antique auction house or on line (eBay, etc) yours would fetch in the range of $300 - $500 for the pair.
They therefore have a full retail or replacement value of $900 which is what you should insure them for.
I do hope this helps!
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