If it's from this side of the pond, it's not a hallmark. It would be a 'pseudo-hallmark' on silver plate. I fancy that the first symbol might be a harp, cynically intended to resemble the hallmark for Dublin which would have a small crown on top of it if it were a genuine assay mark for the city. There's also no purity mark. If it is from over here, I'm not familiar with the maker.