"I/0" for normal thickness of silver-plating. Dark spots you are seeing, are reflections of a camera and other objects. Free of dents, dings and blemishes, absolutely no losses of silver-plating.
Commensurate with age, the condition is excellent. Rare for its pattern, marks and overall condition. This item is in the category "Antiques\Silver\Silverplate\Tea/Coffee Pots & Sets".
The seller is "anyfr8" and is located in this country: US. This item can be shipped worldwide.