The only mark is the one in the closeup photo inside of the handle. It is a small oval, and is in both cups. It could just be a mark made during manufacturing. 

One weighs about 64.6 grams

One weighs about 64.7 grams

Acid tests as genuine silver

We have two other pairs for sale. 

Each is about 3" tall at the tallest point.

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Stock item: B