
186 (20.4 mm width)/186ii (21 mm width), 186ii (21 mm)/186 (20.4 mm), 186 (20.4 mm)/186ii (21 mm)
These stamps were from 1932-1937 and they were printed by Perkins Bacon.
The 186 stamp is Die I and has a frame width of 20.4 mm (wet).
The 186ii stamp is Die II and has a frame width of 21 mm (dry).