01-02-1915 2RM du 1RE, the unit stamp

On the first of februari a lettercover received the stamp:

” TRESOR et POSTES 1 FEVR 15 *109* “

The adres on the cover, which appears to have been written in great haste, using a pencil, is somewhat difficult to read:

Monsier X CH Val
r. du Castris
a Graulhet
Tarn

Clearly visible on the front is also a unit stamp in red inkt, which reads

1^er Régiment Etranger Bataillon B Le COMMANDANT

On the back we find the address of the sender.
Unfortunately his name became illegible due to the fact that the cover has a long crease at its location.
The rest of the address however is well readable.

2^eme rég. de march du 1^er etranger
Bat. B. 4^eme C^ie Secteur Post 109
Marne (front)

Intriguing is why, on the unit stamp on the front, only half of the name of the unit is mentioned ?
Especially since there were not more than for Regiment de Marche attached to the 1^er Etrangere:

• 2^e Regiment de Marche du 1^er Etrangere (2e R.M./1er)

• 3^e Regiment de Marche du 1^er Etrangere (3e R.M./1er)

• 4^e Regiment de Marche du 1^er Etrangere (4e R.M./1er)

Secteur Postal 109

The secteur postal 109 seems to refer to the “Division Marocaine”