This coin has recently been added to the catalogue. It's an 1830 platinum 3 ruble. This is already listed here along with the other dates. The catalogue number is given as Bit#76, a number omitted from the longer listing. Looking at the images, it seems cruder than the others but there's no indication as to what the difference is. If it is sufficiently distinct to be listed separately, could the differences please be specified on the page? Perhaps @Grinya can help?
Former Numista referee for banknotes from Ireland, Northern Ireland, Scotland, Wales and Saint Helena.