Unmarked HUGE embossed silver tray.

[Adam.NYC]

I have 2 of these very large trays. They are 23" long x 15" wide. They are very light - each weighs 2 lbs. 2 oz.

I am sure they are solid silver (I can tell from the edge of the tray), probably 800 or another alloy. The problem is, I can't find marks anywhere on either tray.

Is there any way I can identify this? Is this a common style, assciated with a specific country?

Is there a spot on the tray where marks may be and I just can'f find them?

Any help is appreciated! Thanks!

Adam