This section was for original message.
First Form number was E.T.10 and that soon changed to E.T. 3.
Letters for heading are in serif font and are thin.
AE-RO-1 (lower section shown).
This section was for the reply paid message.
Date stamp box has "FORWARDING OFFICE".
Has a reference to "Cct" at right.
Heading is in larger serif font.
Original message area is below a divided section
facilitating the use of a window envelope for delivery.
Sender details can be more clearly recorded.
AB-RO-3 (lower section).
"Time" is now below "Check" at left.
Reference changed to "Line" from "Cct" at right.