Hi, Imperial Russian gold had three standards in zolotnik: 56 , 72 and 92 . Pure gold is 96 zolotnik, so it is easy to calculate from the equation 96 = 1000: the value of 56 is 583.3 or 14K, 72 is 750 or 18K and 92 is 958.3 or 23K. In short, 58 was not gold standard.(Theoretically, it would be 610.5...