Least Value Circulated Coin Against The US Dollar

I was 7 (in 1976) when we left Portugal, the 5 centavo was found in circulation before then. I used to grab weird money and put in a metal box. That box stayed in Portugal for 43 years until my mom took out all the salvage change and brought it back a few weeks ago. I remember going to the general store and picking up a hard candy for 5 centavos, so at least until the 70's it was still used. That 5 centavos and a few other coins survived my mom's house and the new house she built about 10 years ago. I forgot about it until my mom called me this year. The metal box had rusted and most coins weren't salvageable. This one was cleaned, but it still looks good for a 98 year old coin pulled from circulation in the 70's.