Dear Christine
How interesting ! I have just had a look at Sadler ware, which I'd not heard of, but that seemed to be marked Sadler, naturally enough ! Now I see your vase, I would say not the same stable, the gilders mark certainly, but the body of mine is ribbed , and the glaze doesn't look the same, it doesn't look as modern. I saw recently a big vase in iridescent glaze that was obviously modern, maybe 1970's, and the glaze on your vase reminds me more of that. Perhaps my vase came in the 50's or something !!!!!
Best wishes Gem