Hi Paul, the sugar bowl, and the 330 tumbler which I haven't shown, are definitely 1850s designs. Since I posted this I have been talking to a specialist collector of stemware who has another one, a tumbler with 297 stamped on the bottom, same font on the numbering, design again looking of this period. There is potentially another one from this group on eBay at the moment - I would call it late 1850s, might buy it.