Converted Reichsrevolver Holster

[G41M]

Received a request from a P38 collector as to what these markings mean on the inside flap of an otherwise unmarked Luger holster. Those marks are:
1.Fs.A.R over 2R.
From Jeff Noll's book on "The Imperial German Regimental Marking" it stands for "Fuss-Artillerie-Regiment" (Foot Artillery Regiment) but not sure of the 2R. Maybe second reserves? Please comment if known.
Anyway, the pictures showed the holster had been repaired or altered in some professional way. Reviewed Eugene Bender's book "Luger Holsters" on pages 161-165, which pictured several holsters with similar alterations. This Luger holster was converted from a Model 1883 Reichrevolver Holster. To me, it is not a commonly seen Luger holster, what value would be placed on the holster?