Silver snuff box is it 1820?

[Bartholomew]

https://www.925-1000.com/forum/viewtopic.php?p=171924#p171924

Help with unusual .1000 hallmark

I was hoping someone could assist with identifying the marks on this silver bowl and give me an idea of age and origin. I thought it may be russian but cannot find a reference to these marks anywhere. The bowl is 12cm in diameter. Thanks in advance. [d.jpg] [b.jpg] [a.jpg]