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I think your image is upside down, one of the marks appears to be a crown. All that I can add is that the fact that a crown is present in the marks, would date the spoon to pre-1897, as after that date such a device was outlawed on plated wares.
I'm working on taking a clearer image but most of the marks are gone. So guess it was silver plated at one point and this has all corroded off the surface, leaving a glittery gold like finish brass?