These are great. I had found one current listing on eBay (USA) with one image and also some reference pictures on a site which sources replacement Lalique pieces (also in the US). But these images give much better detail of the stopper... I've taken measurements and it looks like a need a fairly long stopper, approx. 9.5cm from top to bottom, with a stopper width of 2cm (circumference approx. 6.5cm). The width of the 'ball' needs to be approx. 5cm (which is the width of the lip). The stopper needs to have a smooth finish - I've taken some more pics of my decanter with a misfitting stopper (too small, slightly too big stopper but too small ball, rough finish not smoot) to give some more detail and to help me take the measurements. In one of the images you can also see the slight 'lip' within the neck which is where the stopper would sit snuggly and which, as you can see, is quite low in the neck - hence the need for a long stopper. Neil53 - if you have anything that would potentially match then I am v interested...
Thanks as always,
Vx