Art.1916.1920

[Kestraal]

Have Artillary 9mm 8" all matchung s/n 2778 dated 1916 with 1920 above,slightly offset to the right.Was under the impression all Lugers had to be under 4" after ww1 ( this pistol was liberated in Germany after ww2.) any info on this model would be be most welcome. pic enc.