We saw one listed on Amazon for 17,000 placed two years ago.4 dragons on outside one on inside. Research looks like 4 character mark for qing qinglong but we do not know. Can you help us a little with the identification and price[attachment]IMG_20181025_084934664.jpg[/attachment][attachment]IMG_20181025_085002387.jpg[/attachment][attachment]IMG_20181026_110407764.jpg[/attachment][attachment]IMG_20181025_084920389.jpg[/attachment]