Antique Silver on Copper Platters/Chrome in Briarcliff, Pennsylvania For Sale

There are a total of 13 platters. Most are silver on copper. Range of sizes in length and depth. Some with handles, some elevated. These are from my mother's china cabinet believed to be between 50-60 years old. I tarnished cleaned them, but am no expert.
I have no idea of the value and am hoping a collector will get back to me with an honest price.
The large platter is 16 in x 11 in,
The large platter is marked National Silver on Copper xxxx. I have a hard time finding labels on the others.
I live in Delaware County, work in King of Prussia. Willing to meet at either location. Email me here or at jmastexxxx@msn com
610 732 xxxx