Unlike the other mule Panama fineness "error" coins of 1975, 1976 and 1982 this coin is unique that it is not a mule and in that is evidently the only one known or ever reported. It is copper-nickel and has the fineness as an integral part of the reverse design, and NEVER did the Franklin Mint (FM) strike 1/4 Balboas in silver nor are there any other dates, or indeed ANY other specimens of this date struck in any metal with this designation. Therefore it appears to be a pattern. NGC designates the other mule issues of 1975 and 1976 uncirculated "Ley 0.925" coins in its Population census. So does it with the 1982 proof 5B coins with the "Ley 0.925" that were actually struck in 0.500 silver. It also does with the currency 1982 1B and 5B uncirculated coins with the "Ley 0.500" but were struck in copper-nickel. This coin does not receive its own designation in the census and is put in the census with the regular 1983FM proof 1/4 B coins. In fact it must be a pattern, and appears to be quite rare and not otherwise reported in ANY source. I can only speculate that it was struck in the anticipation of a possible Franklin Mint 1983 commemorative 0.500 silver set to be struck on the 80th Anniversary of the country of Panama. Does anyone know anything else?