what is it?

[Hose_dk]

Please visit my post under silverplate. It is a very interesting old sheffild plate .but what?

[Hose_dk]

viewtopic.php?f=18&t=33298

Its this one - dont know how to make a link from my tablet. So here is one from my PC.
I bought it today and its strange. I cannot find any meaning with it but engraving is Deep cut and very detailed and butifull.
So please give any idea, a clue of origin, use and age.