antique silver over copper tray, huge vintage estate silver plate serving tray

Huge old silver plate over copper tray, 28 1/2" over the handles, 19 1/2" x 13 1/2" over the tray area, weighing 11 1/2 pounds!

This is beautifully tarnished (we've left it just as we found it) so it's a little difficult to make out the hallmarks aside from the silver over copper marking. The plate looks good, we didn't see any of the copper showing through.