So I've owned one of these in the past and had some time to study it. Most people usually use the beads over II to tell the difference but it can still be difficult at times.
When in doubt try this.
Use the beads over Regina. Specifically GIN. On both small and large beads, there will be a bead above the serrif on the "G" and directly above the first bar of the "N"
The difference is, the small beads variety has 5 beads total here and the large beads has 6 beads.
