Tin Pitis coins

Hello guys!

I get some intersting coins, so far I know:
- Malay peninsula
- material: Tin



The other sides are blanc.

Up left coin (hexagonal): 17,3mm, 0,69g
Up right coin (round with hole): 19,4mm, 1,21g
Bottom left (round with hole): 14,6mm, 0,39g
Bottom right (round): 14,8mm, 0,74g

The last one, I think will be this. I can read the date on that one :)

Can you help with the others, and can you confirm that one is the right?

Thank you!

the 1st is:
https://en.numista.com/catalogue/pieces50591.html
inside the numista side you can see the different variants

See http://www.fsrcoin.com/palembang.html