Looking for an opinion on whether this Russian sugar bowl is authentic.
As far as I can tell the marks are:
M*K over 1833: assayed by Mikhail Mikhailovich Karpinsky in 1833
Anchor/scepter: St. Petersburg
84: 84 zolotniki (0.875 parts silver)
FB or JB?: Unknown maker mark
The marks didn't raise any red flags for me, but I am wondering if the construction provides any clues to it being authentic? The indent and scoring on the bottom looks as though the piece was lathe turned, and it is hard to tell if the finial is threaded into the lid, but I will know more when the item arrives.
I am also curious if anyone can identify the maker?
![Image](https://i.imgur.com/sTFNixn.jpg)
![Image](https://i.imgur.com/Z98vz8M.jpg)
![Image](https://i.imgur.com/6fuoimw.jpg)