I never thought of this, but yes, they did pointlessly add an 'on' in there just because they thought it would sound cooler, even though the literal translation wouldn't have an 'on'.
If somebody from the 50s in america travelled through time to today, they would question how people here make 10s of thousands of dollars per year, and yet would still pay 40 times a coins denominational value to get it.
I asked the AI about the double-disme piece from the US, but then it started talking about a half-disme piece, which was both way too expensive and not what I asked for, just 4 minutes ago.
The 1944 (and several other years that I don't own one of) Philippine 20 centavos piece was minted in the USA, and thus, by technicality, according to the US Federal Coinage Act of 1965, is legal tender in the USA.