This is my own personal collection which has yet to be fully completed. If there is an addition to this collection, i will update. Most of these coins are not very old, but I choose dates below 1970.
USA Five cents 1927 (buffalo coin) - Size 20mm
USA One cent 1891 (Indian head penny) - Size 18mm
Germany 10 pfennig 1876 - Size 20mm
Thailand 1 Baht 1962 - Size 25mm
Great Britain 2 Shillings 1951
Great Britain 1 Shilling 1954
Malaysia 50 sen 1967 - Size 27 mm. Security edge
Malaya and British Borneo 1 cent 1962 - Size 17 mm
China and Hong Kong
Arhat memorial coin - Size 40 mm
Japan 10 sen Showa era 1942 - Size 22 mm (aluminium)
India 25 paise 1961 - reverse
India 25 paise 1961 - obverse
Indonesia 50 Sen 1952
Nederlandsch Indie 2 1/2 Sen (Se perempat Rupiah) 1945
Pitis Palembang (1776 - 1804) - made from tin and minted one side only
1 cent 1878 - Size 18 mm
p/s: Tips to brighten rusty old and dark coins. Just soak them in vinegar (not fruit vinegar). Within a few minutes, the money will be bright insyaAllah, without the need to be scrubbed. If scrubbed with a toothbrush will be faster.
Do not rub the coin with iron brush or scrubbed at rough places arbitrary, because the money will scratched and will probably depreciate.
Then for silver coins, just scrub using a toothbrush with a toothpaste on it. Save money. Wallahu a'lam. :-)