On "hot" vs "not" all I can do is look at ebay, where I see that 18 vintage (pre-1930) 1 libra coins have sold in the last 60 days, and the inventory is not super high compared to that figure (currently 28).
Unslabbed examples are selling faster and have lower inventory/sales ratio (small data set though), but also lower price.
Unslabbed examples are selling faster and have lower inventory/sales ratio (small data set though), but also lower price.






















