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Thank you for the replies.
Now I have another question.
Why somebody have done that kind of circular shapes on a plate?
For me it looks more like a finish of a factory machine.

AG2012 wrote:Sometimes the bottom of silver items is polished like this with circular buffing tool.
Regards

Hi AG2012,
This mean that it was not made originally?

This is a bottom of a plate from Italy. Marked with "800" and "376AL" (PERUGGIA & C., Alessandria). I am asking about the grinded pattern on the bottom of this plate - overlaping circles. Is it original or was it made nowadays? I have never seen something like this on a silve...