I recently purchased this auctions as a silver plate item, but when tested it turned out to be silver. I have not been able to find an example of the Maker's Mark anywhere and no one I have spoken to has any clue what it is. I am hoping someone on here can help me in any way. Thanks
Hi, ``Sun`` marks belong to Matthew Boulton, Birmingham. It`s silver plated (Old Sheffield plate), but there is long and famous history of Soho manufacture and Bolton family. Nice piece. Take a look here: https://en.wikipedia.org/wiki/Soho_Manufactory
As AG2012 has pointed out, the chamberstick will be Old Sheffield Plate and you would permanently damage the piece attempting to get a positive result. The thickness of the silver is far greater with OSP than that applied with electro-plating.