Dutch Gulden 1931 Resistance

I found this Gulden from 1931. The head of the queen has a helmet and the text has changed to WILHELMINA In LoNDEN.

Somebody told me that it was from the resistance. Does anyone know more about this?

Woow, nice!
It is probably 'trench art'
I do not think it is money that was used as 'money'
It would take ages to produce these manually

These coins regularly show up in auctions etcetera. I'm afraid I have to say yours is not the nicest one done.
Here are some other examples, even proofs:
https://www.google.com/search?q=%22Wilhelmina+in+London%22&lr=&as_qdr=all&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwimyo_SxuTcAhUNKVAKHTI9DkAQsAR6BAgFEAE&biw=1920&bih=947#imgrc=_

Citeer: "PetrusAscanus"​Woow, nice!
​It is probably 'trench art'
​I do not think it is money that was used as 'money'
​It would take ages to produce these manually

​Yes, it's always interesting to see politically motivated defacement of coins (as opposed to purely artistic "hobo nickel" style coins). My favourite is the Prussian helmet carved onto bronze centimes of Napoleon III after his defeat in the Franco Prussian War in 1870. But back to your coin, here are more infos on this sort:

https://www.coinworld.com/news/world-coins/2016/04/wartime-folk-art-appears-on-silver-dutch-coin-in-karel-de-geus-auction.all.html

Here is a particularly nice one (they did the reverse too):

Citeer: "CassTaylor"​

Citeer​
​https://www.coinworld.com/news/world-coins/2016/04/wartime-folk-art-appears-on-silver-dutch-coin-in-karel-de-geus-auction.all.html
​
​Here is a particularly nice one (they did the reverse too):
​

​Nice and intresting link!
So it is a 'resistant' coin

@Petrus
No need to thank me for the link.

If you're interested I know about this other Dutch wartime relic made of coins:

6 and a quarter cents (made of a 5 cent piece, a 1 cent piece and half of a 1/2 cent piece) was a way used to mock Arthur Seyß-Inquart, an Austrian Nazi who served as Commissar of the occupied Netherlands during WWII (apparently his surname sounded like 6 and a quarter in Dutch).