The Nash/Richmonds 5 speeds have 1:1 5th gear. They have deeper 1-4 gears.
The OP seems to be looking at a Nash/Richmond 5 or 6 speed.
So you run 2.71 to 3.23 rear gears but acts like much deeper gear.
The notes on that Nash owners manual I posted are not mine. But you see where the...