I will probably be roundly excoriated for this, but here goes.....
If it's silver on copper, I'd consider selling it for melt value. I sold a platter similar to this one, figured it was worth about $20, it sold on eBay for nearly $60, and I was flabbergasted. I asked the buyer later why thought bought it, and it was the weight of it that was the huge attraction -- it was worth more for melt value because of the copper!