This is a rare item, almost never seen at coin shows, worth about $300 or more.
You could try searching on eBay -- you might get lucky.
I have one if anyone is interested. it's the coolest coin i have. i want $499 for mine as there is an engraving on the inside that says "Papa 1890" and has the original picture cover inside. no picture. this one also closes very tightly and snug. it is the best example i have ever seen anywhere else. one press of the thumbnail on one side of the rim on the reverse, and pop, it pops open perfectly. very awesome design and still works perfectly to this day. the coin itself is an 1878 S Trade Dollar and i would grade it about an VF which is actually a high grade for these opium dollars. typically all the others ive seen have been fine or below, but usually not below VG. you can contact me through ebay under the store name 2unique4antique. i'm not a dealer, just have an ebay store where i sell a few things.
See: India/Opium Trade
The tea and Opium trade
Bc Britain wanted to trade their opium for china’s tea
selling opium
The opium trade was extremely profitable for the British, and thus they wished to end the ban of opium in order to resume the opium trade and make profits.
The tea and Opium trade
The reason why Lin opposed the opium trade with Britain was because of opium abuse. There were already serious issues with it and Lin did not want to do anything to make them worse.
The Chinese government called on Britain to stop trading drugs when they outlawed opium. Britain would not cooperate, nor would it stop trading drugs. This led to the Opium War of 1839.
They helped ban the opium trade.
a treaty ending the Second Opium War
Britain gaind the right to trade with china
The British wanted to trade opium for China's resources.