Need help identifying this silverplate...

[hassiman]

Here is silverplate from my grandparents collection. I need to identify it, but I know nothing about this stuff!!!

Here is an interesting platter:

[code]

Here is its hallmark.. I assume this is silverplate:
[code][/code]

Here is a nice Round plate:
[code][/code]
Here is the marking on the bottom:
[code][/code]

My grandparents also have a large collection of Japanese, Chinese and Korean ceramic antiquies. I was wondering if there might be a list like this one that might help me identify them?

Thanks so much for any assistance you can lend.