From what I understand, it is silver, yet of a lower grade such as nickel silver. It was refed to often as 'blackened silver', or something similar. Whatever you do if you hope to sell it - do not remover the tarnish.
Meriden B. Company was started in Meriden, Ct in 1852 and manufactured silver items. The bought Rogers Bros. in 1878 and were one of the original companies that joined together to form the...
Meriden B Company was a manufacturer that made silverware out of "black silver" the kind of silver that was economical doing the time, it still had the flare of expensive silver settings and today...
Napoleon III's gold service was, in fact, silver electroplated with gold - the process had just been invented. Of course, once this was known, 'silver gilt' became a metaphor for the second Empire.