5 Mark Bavaria with black printing imprint "SARRE" from Bogenfeld 9 with a left-hand blank space, perfectly mint never hinged, examined by Dr. Dub and examined by Burger BPP with photo certificate copy for former sheet, only a few specimens with four-sided perforation in the blank space have been known so far, rare opportunity to acquire! Ideal for advanced exhibition or special collection of the Saar region!