Help identifying 4 Asian coins

Hello community members!

Can you please help me identifying the following coins?
I found them in a can of tea back in Cuba, my uncle used to collect them.
I have no idea where did he find them in the first place.

First:


Second, this one (as well as the third) looks like Japanese or Chinese by the characters,
but I couldn't find it in the catalog:


Third:


Fourth, this one is very light, the composition is certainly Aluminium:

Wow! Did you see that the date reads "2039"... it must come from the future!!

Thanks.

4th coin is of Nepal and I guess its 5 paise (5 cents).

The first coin is a Thai 5 Baht from 1972:
https://en.numista.com/catalogue/pieces9431.html

The second is a Taiwanese 10 Yuan from 1983:
https://en.numista.com/catalogue/pieces1587.html

The third is another Taiwanese coin, this time a 1 Yuan from 1981:
https://en.numista.com/catalogue/pieces966.html

The fourth is a Nepalese 5 Paisa from 1982:
https://en.numista.com/catalogue/pieces1571.html

All circulating coins with little additional value beyond face value.
Welcome to Numista, by the way!

Thank you.

Цитата: "Ajeet"​4th coin is of Nepal and I guess its 5 paise (5 cents).

​From the future? no no
It is the Vikrama Samvat (VS) era
Just subtract 57 from the VS date to find the AD date
२०३७ = VS2037 - 57 = 1980AD