In order for me to properly assess what you have I will need to see images and clear, in-focus close-ups of the marks.
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.
I received your images. The other question thread did have to be closed as it is considered a duplicate posting.
I just looked over the images. The most important 'clue' I need to see is a very clear, in-focus close-up of the mark and the letters following the fancy S in the hallmark. If you can please post them here, it will be very helpful.
From the images provided and the style of the mark that I can see, this is a silver plated tea pot. Plated silver does not carry a precious metal meltdown value like sterling silver does. On today's market, an antique Fenton Brothers plated teapot sells for an average of $20 and a high of $60. If indeed sterling silver, it can sell for up to $300. If silverplated, you will only want to do a light handed polish to the surface, as the plating can easily wear off over time with too much 'shining up'. Overall however if you are planning to sell this, buyers do prefer to see these polished over tarnished.
Just checking in to see if you viewed your answer and if you are seeking further assistance?
Please let me know.