Picture Tray

I found this picture tray at the Russian-run thrift store a block west of the Kingsway T&T, north side. The price was nice ($9.99). I need a tray to serve tea in my garden. Also the mystery of what might lie behind it.

Here is the back of the tray:

And behind its backing:

And behind that, bonds issued by the 1917 Kerensky Provisional Government.

When the tray is not in service, it hangs on the wall. But not on my wall.