As Adrien has indicated, without clearer photos, identification is virtually impossible. Providing the
dimensions and
weight of the object would also be helpful.
The mark is, of course, the Japanese
jungin mark. I can think of no documented example of this mark being applied by the Japanese to an unmarked Chinese work, but I would not entirely rule out the possibility. There also was a fair amount of borrowing designs. See, for instance, the Liscum Bowl by Arthur and Bond, in the Contributor's Notes:
http://www.925-1000.com/forum/viewtopic ... 38&t=24259
As these recent posts remind us, there certainly was no shortage of dragons in Chinese and Japanese export silver,they were plentiful enough so that every visiting wizard could bring one home as a souvenir of the Oriental tour. Without a maker's mark, however, the best one can hope for is to find the exact same item with a full set of marks and hazard an attribution. Perhaps with a bit of luck, or magic, one will turn up.
Regards,
David R