Not sure whether the face value is explicit (edge maybe? probably not with gold, but I don't know) or implicit, as in, a 250 kuruş piece is always 18.04g and a 500 kuruş (5 lira) piece is 36.08g. The nominal value is not that important anyway, as these coins commemorate anniversaries of 1923 when the Turkish Republic was founded.
Such a bullion piece will always say "Türkiye Cumhuriyeti 1923", followed by the year of the republic. So "year 20" should mean that the coin is from 1943, etc. As far as I know, these bullion coins are still minted these days, at least the version with Atatürk's portrait ...
Christian