Vasa coat of arms under crown, date in fields - 16-51, CHRISTINA D G RE SVECI around / Coat of arms of Reval under crown, I-OR in fields (for the denomination), MON NOVA CIVITAT REVAL around. 19.5mm, 0.86 grams. Fyodorov #249; KM# 6.
These coins were crudely minted with a rolling press, resulting in crude coins which are usually struck off-center. They were made of lower quality silver, with the surface enriched in silver to improve its' appearance. Scarce this nice and with a visible date.