I have several questions about this cover if I may ask for some help.
How do you tell the difference between an #6 and an E8 without taking the stamp of the cover?
I think that the 2 cent stamp is a booklet
stamp 425 is that correct?
How common is it to have an error in the date on the reverse of the envelope. The one RPO stamp indicates the year as 1913 while other date stamps say 1914.