Costa Rica 1892 25 centavos with 1923 50 centimos counterstamp

This coin is no longer in my possession--I gave it to my dad for his birthday, as he was born in Costa Rica. It looks like a 1923 counterstamp valuing the coin at 50 centimos over an 1892 25 centavos. I can't find much about this revaluation, nor can I find an entry for this type of counterstamp in my old (1995) Krause guide.

Looks like the 25 centavos was 6.25 g at .750 fine = 0.1507 oz ASW
The only silver coin I can find from after the introduction of the Colon in 1920 is the 1924 25 centimos, which was 3.4 g of .650 fine = .0721 oz ASW.

So it looks like 1 colon of 1923 was worth about half of 1 peso worth of silver from 1864-96. (The peso itself was a gold coin in that era.) It must have been a moving target due to high inflation or something, as none of the Colon coins seem to have been made of silver after 1924, until some commemorative stuff around 1970.

Can anyone enlighten my as to why this revaluation took place and why these coins were counterstamped? Thanks!

 

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https://en.numista.com/catalogue/photos/costa_rica/571-original.jpg

 

Here's a link to the whole page instead of just the photo: https://en.numista.com/catalogue/pieces8764.html