The order of service nr 22, published on 19/10/1910 introduced the use of bilingual stamps.
Technical caracteristics:
  single circle stamp with he name of the post-office in the crown
date piece in the middle on 4 lines:the hour in 2 numbers from 0-24.
the day in Arabic figures.
the month in Roman figures.
the year in four figures.

The name of the post office who could be translated was put in the under side of the crown. The language of the part of the country the post office was situated was put first.When the name of the postoffice couldn't be translated, the underside was fillled with a number of points; seven for the greater offices,13 for little post offices.When there where more postoffices situated in one county, the name of the street or county was not used anymore, but each received a number. These numbers who identified the different post-offices in one county, were mentioned in the stamps, to the left and the right of the postoffice name . These could change accordingly to the our and the cemploy‚, and gave a form of control.The stamps of arival were the same as the stamps of the departing post.
All Belgian offices where equiped with at least 2 date stamps , to have one in reserve when the other was defected. Each stamp was made by hand, therefore little differences exists between the postmarks.


The set 'de Mérode' stamps could only be used in the internal mail traffic in Belgium. Nevertheless they are found frequently on courrier to foreign countries, but then they are used more as a 'vignet' to support the Red Cross and as a tribute to the Belgian war effort.In the internal mail traffic a correct tarrification is also seldom, here too we find exaggerated tarrifications.

Inland port (departing from 1/07/1909):
   brief inland letter from 0 until 20 grammes.
   inland letter double port (20 until 40 grammes).
Recommended post:
   25 centimes fixed right on top of the normal tariff.

Port to foreign countries (departing from 1/10/1907):
   letter from 0 until 20 grammes. + 15 centimes per 20 grammes more.

Preferential port:
   to Luxemburg 10 centimes (until 20 grammes).
   to The Netherlands 20 c (until 20 grammes).

Border port : used for mail between post-offices on both sides of the border who had a distance of not more than 30 km between them : port to Germany, France, The Netherlands : 10 centimes (until 20 grammes).

On the basis of the exterritoriality principle the mail-office in Le Havre was considered to be Belgian territory and all mail delivered to that office and payed for with Belgian stamps was considered belonging to the Belgian territory. So mail from Le Havre to other parts of the Belgian territory was considered to be internal mail and an ordinary letter, until 20 grammes, has to be payed for 10 centimes.All buildings in Le Havre belonging to the Belgian administration were considered to be Belgian territory, and were subject to the internal Belgian tarriffs.