Coins, Sweden, Riga. Kristina, SB 37, 1 dukat 1645. 3.39 g. This example shows an obverse with inner ring and reverse without inner ring. However the reverse is different to that of SG 30, but instead the reverse of SG 29. This die combination is not recorded in the literature, but appears on examples sold by WAG auction 80 lot 1640, MISAB auction 29, lot 230, and MISAB auction 21 lot 269. RR. SG 30 var. 1+/01.