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This is indeed an unique Queen Anne piece of porringer to me that i want to call it Trophy due to its size. My query is what is this look-alike coat of arms? Royal or a family related? And i have a hint of doubt if this engraved at a later time because another side of the shield area is mirror clean.

The one with cross and wheat garbs appears to be the coat of arms of Vernon of Hanbury. Here's a link to the Wikipedia entry of Hanbury Hall where you can see the coat of arms above the entrance:

https://en.wikipedia.org/wiki/Hanbury_Hall

I don't know the other coat of arms but when coat of arms are combined like that they are usually for a married couple (the Vernon coat of arms in this case are for the wife).

Thank you, Sir. Again, It seemed to me this was engraved at a later time than the porringer was made.

The dexter baron (i.e. husband’s) arms are those of Haywood: argent, three torteaux in bend between two bendlets gules, all within a bordure of the last (crest: on the stump of a tree, a falcon rising, proper), thus Haywood impaling Vernon.

These are the arms of Francis Haywood (1794-1858) of Sillin, co. Worcester and his wife Lucy Vernon (1799-1871), daughter of Thomas Shrawley Vernon of Shrawley and widow of Robert Boulton Waldron; they married in 1826. There are memorials to the couple in St. John the Baptist Church in Feckenham, Worcestershire.

Hope this helps!