Also unidentified - well worn

Can anyone help identify these?

 Netherlands and Mexico.

I typed  NEDERLANDEN  and  1917  in Search, for the first coin.
Netherlands silver 10 cents from 1917 date.
https://en.numista.com/catalogue/pieces5264.html

The other I went to  MEXICO  and added  20  after, for the second coin.
Mexico copper-nickel 20 Centavos from 1977 date.
https://en.numista.com/catalogue/pieces1012.html

Thank you! You really are good at this. You make is sound so easy...

Thanks - I know quite a few (countries and coins) by now (but certainly not all), as I have many to exchange. For those that I am not sure of I either go to the country list and add whatever details I know after the country name; or I go to the Search and enter as much as I can read on the coin.

Cita: ZacUKThanks - I know quite a few (countries and coins) by now (but certainly not all), as I have many to exchange. For those that I am not sure of I either go to the country list and add whatever details I know after the country name; or I go to the Search and enter as much as I can read on the coin.

i think zacuk is great at what he does,i dont know why he is not on the  numista team