www.CostaRicaTicas.com

In November, older c1mil notes will cease to be accepted as payment. They will be able to be exchanged at banks. All current c1mil notes are red polymer. The old ones (series A & B) have a small transparent window with a portrait and leaf in the top right corner. The newer (series C) have a larger transparent window which spans the entire width of the bill.

https://www.crhoy.com/economia/series-a ... noviembre/

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If you let the devil ride, he's gonna want to drive

Thanks you Boynton for this info. I've had to change out old Colones a couple different times. The last was after the pandemic. Went to BCR inside INS and was a pretty smooth exchange.