Valuable Antique "Old Sheffield Plate" Samovar or Tea Urn

This lovely hot water or hot tea urn is a real treasure!  I've talked about "Old Sheffield Plate" many times and this piece may be the oldest I have had.  It was evaluated by a my silver expert and was identified as "Old Sheffield Plate".  I will explain more below but "Old Sheffield Plate" was a process of sandwiching silver plate over copper on both sides and forming sheets.  It was a tedious hand crafted process that is now very collectible and rare.  The older the piece the simpler the decoration and form which is why this samovar is likely from the late 18th century.  Note the acorn finial, the arched handles mounted with leaves, and the beaded trim.  The fabulous spigot  turns on and off with the handle made from a natural (Often these handles are not still present)  It does not have a warmer underneath as they were not invented until the 1800's but it shows where a special piece of metal would be heated and sit on the bottom of the pot to heat the water.  This is a special heirl