Identification Of These Coins (Pics Added)

First one is an old script Japan 5 Yen. The date is on the back.
2nd is a wartime Japanese 1 Yen. Date is also on the back :D
3rd is a wartime 10 sen. Date also on the back.
4th is I think also a 10 sen from later in the war. You've got it upside down, by the way. Date is Showa 19, which is 1944
5th is :O THE COVETED FAT MAN DOLLAR! This is a 1914 Chinese silver dollar with Yuan Shikai. It's quite commonly counterfeited. Wonder if yours is real...
6th is a cash coin from Qianlong Emperor, Beijing mint. 1735-1796

Post the reverses up and I'll give you the dates. Do you need KM numbers for these? I'll dig out the Krause and look them up for you if you'd like.

I don't know why people call it the fat man dollar/coin. Yuan Shikai or YSK is fine enough. I agree with swamperbob, it is not a dollar denomination coin when I first saw it. High chance of being real.

1) Japan 5 yen Showa year 25 = 1950 (Y#72) Showa = name of era of Hirohito
2) Japan 1 yen Showa year 25 = 1950 (Y#70)
3) Japan 10 sen Showa year 17 = 1942 (Y#61a)
4) Japan 10 sen Showa year 19 = 1944 (Y#64)
5) China 10 cents (1 chiao) year 3 = 1914. Weight must be 2.7 grams (Y#326)
6) China cash indeed emperor Kao-tsung with the reign title Chien-lung (1736-1795) Mint = Peking Kung-pu board of public works.(KM#390?)
7) China cash emperor Jen Tsung with reign title Chia-ch'ing (1796-1820) Mint: same as above (KM#442.1)