Algerian post encouraging the use of postal code in 1990

Encouraging to use postal code is now a new label on this blog.

This encouragement is the message of this Algerian post's pictorial cancellation of 1990 : "Postal code : five digits / to sort quickly your mail". The stamp depicts automobile repair jobs.

I imagine that green and red signs of the air mail enveloppe replaced avantageously the usual blue and red, too close to the French flag.