In order for me to properly assess what you have I will need to see images and clear, in-focus close-ups of the mark
If you had already attached images to your initial posting, they are not showing for me here on my end.
Please send the photos at your convenience. There is not an extra charge to provide more pictures here.
Thank you for the image of the underside. Do you have a photo of the vase itself to add here.
Thank you for the images, I am fairly certain it is not English as wares from there are very diligently marked and registered.
In the meantime, I will opt-out here and open your question again to all the experts at no additional charge. If someone knows the answer, they will respond to you here. You do not need to re-post your question.
I do hope you find the information that you seek.