I think this is Chinese, recent production (within the last 10+ years) and sold via British Heart Foundation. I have one almost the same shape in a different colour-way, with stopper. I can't find a photo of it (I was sure it was on the board somewhere but hey-ho...) I'll take another set of pics and add them for you to compare - most likely be tomorrow. Quality wise you would struggle to guess Chinese, and the base is polished beautifully clear and flat like yours.