Although not in the best condition, does anyone know if it was common to find such a considerable height difference in these two stamps?
Also, the E11 stamps are known in ultramarine, pale ultramarine and dark ultramarine, and E11c in blue. Realizing that you can't be too exact based on a scan, what color identification would you give to these two examples?

Edit: Sorry, mismarked in my stockbook. Changed ID from E6 to E11, as the stamps appear unwatermarked.