James - sincere thanks for your input, and this just might have the potential to be quite old then.
Unfortunately, Electro plated piece are very rarely marked with a date, although I believe that the English company of Elkington did use a date letter, although whether they did so all the time I am unsure. As far as the U.K. goes, I believe that the letters EPNS were shown more commonly on metalwork from the late C19 onwards, although the process itself goes back a lot further than that. Your comments support Lustrousstone's suggestions that the base may well have been added later, here in the U.K. possibly. Apparently, the style of metalwork can sometimes be an indication of date, but I'm not too well up on the these bases to say, other than that it looks very 1920 - 1930 to me, and the style of lettering for the EPNS is quite ornate with the 'double lines', so may well indicate the 1920's. But whatever, it is a fine piece of carnival, and will be kept by me. thanks to all for the help. Paul S.