I'm no expert, but I can help you figure which way is up. They are all relatively new for Chinese cash coins, less than 400 years.
Once you put them right way up you'll see a couple are from the same emperor.
number 1, 5 and 6 seem to be Qian-long 1736-1795. Fairly common one I run into frequently.
Цитата: "Seeker55"4 and 5 are the Shan Lung variety 1796-1799.
I don't believe they are, they are simply a later date of the standard variety, Shan Longs are actually determined by the bottom character, the Hartill catalog is a better determinant of these coins than calgarycoin which can be a bit simplistic at times.
Arusak is probably right about two of the Kao Tsung coins (numbers 4 and 5) not necessarily being the Shan-Long variety. I'm not an expert on Chinese coins, and just go by the shape of the top characters and what I read in the identification websites.