Belgian Military Post in the Rhineland
On 20 September 1920, Belgium released the first overprints for use in the Rhineland.
The Franc valued were printed with two perforations — A suffix: L 13 3/4 to 14 1/4 and C suffix: L 14 3/4 to 15. The initial issues featured one of two types of overprint.
Type II Overprint
“D” under “AG”
In 1920, a second printing was done of the Franc values. This printing again featured two perforation types, but used a slightly different overprint.
Type III Overprint
“D” under “A”
Finally, three additional values were issued on 1 June 1921.